After all the trouble I went through with gyoza, I decided to try fried rice in the same iron pan.
The lessons I’d learned from gyoza were simple: preheat thoroughly, coat the surface with enough oil, manage moisture carefully, and use a thin stainless steel turner when it’s time to release. I figured the same principles should apply to fried rice.
Preparing the Rice — No Water, No Exceptions
Before I started, I came across an article claiming that rinsing cooked rice removes excess starch and makes it easier to fry up fluffy and separated.
But I had the gyoza incident fresh in my memory. I’d rinsed the wrappers under water, and they stuck completely — a disaster. That experience made one thing clear: getting the rice wet was not an option.
Instead, I left the freshly cooked rice to sit for about 30 minutes, letting the surface dry out slightly before using it.
How I Cooked It
The ingredients were straightforward: green onion, bacon, two eggs, and rice.
I preheated the pan thoroughly, then added about 3/4 tablespoon of oil. I stir-fried the green onion and bacon, then pushed them to the side. I added another 1/4 tablespoon of oil, poured in the beaten eggs, and placed the rice on top, breaking it apart as I went.
It stuck a little at first. But this time, I didn’t panic.
Unlike gyoza, the rice was coated in egg. I knew that protein contracts when heated and releases from the surface over time. I kept calm, sliding the stainless steel turner along the bottom to loosen things up — and gradually, the rice stopped sticking. By the end, I had fluffy, separated fried rice.
Why It Was Easier Than Gyoza
Gyoza wrappers are made of starch. The more moisture they get, the more firmly they bond to the pan. Even a small lapse in moisture management was enough to make them stick so hard that even a stainless steel turner couldn’t get under them.
Fried rice was different. Rice is starchy too, but the egg coating weakened the bond enough that even when it stuck, the turner could slide underneath without much force.
In the end, the lesson from gyoza — that starch-based foods come down to moisture management and the right tool — applied just as well here. The egg just made everything a little more forgiving.
One thing to fix next time: the green onion burned slightly. I’ll move the cooked ingredients to a plate before adding the egg and rice.
Final Thought
I’d bought extra ingredients expecting things to go wrong. They didn’t — it came out better than I expected on the first try, and the backup supplies went untouched.
They say a cast iron pan gets better with use. It seems I’m getting better too.
A while back, I wiped my iron pan with a tissue before cooking. It came out dark.
My first instinct was that something was wrong. But after looking into it, I found it was completely harmless.
What’s Actually on That Tissue
There are two main culprits.
The first is carbonized oil and food particles — residue that builds up on the surface with every cook. It sits on top of the pan, and it washes off.
The second is iron particles. These come from the surface of the pan being physically abraded. If you’ve been washing with something abrasive like a steel wool scrubber, that’s likely the cause. As the polymer layer develops, this tends to decrease over time.
I couldn’t tell which it was in my case, but once I started washing with a small amount of dish soap, the tissue stopped coming out black. That part of the mystery was solved.
But One Question Remained
When I started using dish soap, I worried I was stripping away the layer of oil I’d been building up over time. In practice, though, the pan’s performance barely changed.
Why? Because the black that remained on the pan’s surface was something else entirely — something that dish soap can’t touch.
What the Polymer Layer Actually Is
When an iron pan is used repeatedly at high heat, the oil undergoes a reaction called oxidative polymerization. The oil molecules bond together, forming a solid, stable layer on the surface. This is what’s commonly called seasoning — the same process that happens in cast iron skillets and woks.
This layer doesn’t wash off with a light scrub. As long as you’re not scrubbing aggressively or soaking the pan for extended periods, dish soap won’t break it down. That’s why changing how I washed the pan made almost no difference to how it cooked.
Why Iron Pans Develop a Polymer Layer — When Others Don’t
Pans with non-stick coatings or stainless steel don’t develop the same kind of layer. The reason comes down to the nature of iron as a material.
Iron has a porous, microscopically rough surface. Oil molecules can work their way in, and at high heat, oxidative polymerization causes them to bond and form a solid layer that actually stays put.
Non-stick coatings (like PTFE/Teflon) are chemically inert — nothing adheres to them, including oil. There’s no surface for a polymer layer to form on, and that’s by design. The whole point is that things don’t stick.
Stainless steel has a smoother, denser surface than iron. Oil doesn’t penetrate as easily, and while some polymerization can occur, it doesn’t build up into a stable layer the way it does with iron.
In short, iron pans are uniquely suited to developing seasoning because of their rough, oil-absorbing surface combined with the chemical reaction that heat makes possible.
The Black Follows the Heat
The darkening isn’t uniform. Looking at the bottom of my pan, the black appears not in the center, but in a ring — a donut shape. That’s because gas burners release flame in a ring, so the heat concentrates where the flame actually touches. Polymerization accelerates at higher temperatures, so the layer builds there first.
In other words, the black on your pan is a heat map.
With regular use, the seasoning gradually spreads outward from there.
Telling the Difference from Rust
The polymer layer and rust can be distinguished by how they look and feel.
Polymer layer
Appearance
Even black to dark brown
Texture
Smooth, matte
Rust
Appearance
Reddish-brown, patchy
Texture
Rough, flaky
As the polymer layer develops, it fills in the microscopic gaps on the surface, leaving less room for rust to take hold. If rust does appear, it’s usually a sign that the layer is still thin — or has been damaged.
Final Thought
I’ve never done any kind of deliberate seasoning — no oven treatments, no multiple rounds of heating oil. I’ve just been cooking with it regularly, using a small amount of oil each time, and washing it simply when needed.
And yet, the pan has gradually darkened and performs better than when it was new. I’m curious to see where it goes from here.
For a while, I’d noticed that heating olive oil at high temperatures left my throat feeling irritated afterward.
I searched “cast iron pan throat pain” but couldn’t find anything relevant. I assumed it was just my imagination and let it go. But the feeling kept coming back, so I decided to look into it properly.
It wasn’t my imagination.
The Culprit: Acrolein
Every oil has a smoke point — the temperature at which it starts to break down and produce visible smoke. When oil exceeds its smoke point, it undergoes chemical decomposition and produces a compound called acrolein. Acrolein forms with any oil, but oils with a lower smoke point reach that threshold faster.
Acrolein is a strong irritant to the mucous membranes of the eyes, nose, and throat. The irritation I’d been feeling was most likely from inhaling it.
Why Olive Oil Is Especially Prone to This
Smoke points vary significantly depending on the type of oil.
Oil
Smoke Point
Butter
~150°C
Extra virgin olive oil
~160–190°C
Grapeseed oil
~215°C
Canola oil
~200–230°C
Sunflower oil
~230°C
Rice bran oil
~230°C
Ghee
~250°C
Avocado oil
~270°C
Extra virgin olive oil has one of the lowest smoke points on the list — around 160–190°C. It reaches its threshold faster than most other oils.
I had been using extra virgin olive oil. And I had a habit of preheating my cast iron pan until it just started to smoke. That means I was regularly heating the oil past its smoke point. The conditions for acrolein production were there every time.
Refined olive oil has a higher smoke point of around 240°C, so the same cooking style would produce less irritation. That said, extra virgin retains more flavor and health benefits. It may be worth using different oils for different purposes.
Oils That Work Better with Cast Iron
Cast iron pans are often used at high heat, so oils with a higher smoke point tend to work better. Based on the table above, rice bran oil, sunflower oil, canola oil, and avocado oil are all solid options.
Rice bran oil A staple in Asian cooking, long used in cast iron pans and woks. Neutral in flavor, so it won’t affect the taste of your food. A practical choice for everyday use.
Avocado oil One of the highest smoke points available. Mild flavor and easy to use — though it tends to be more expensive.
Canola oil / Sunflower oil Widely available and affordable. Neutral flavor and high smoke point make them reliable for everyday cooking.
Extra virgin olive oil Rich in flavor and health benefits, but not well suited for high-heat cast iron cooking. Better saved for low-heat finishing or uncooked uses like dressings.
Final Thoughts
I’d read that heating a cast iron pan until it smokes was the right way to preheat it. With no PTFE coating to worry about, high heat seemed like a non-issue. And the pan itself was fine. But I didn’t realize that the oil you use can turn that into a problem.
Now I use rice bran oil for cast iron cooking and save the extra virgin olive oil for dishes that don’t involve high heat.
I also stop preheating before the smoke appears. If I see the faintest wisp, I lower the heat right away to keep the pan from getting hotter than it needs to be.
I’m glad I didn’t just ignore the feeling. If you’ve noticed something similar, it might be worth checking the smoke point of the oil you’ve been using.
Before adding water for steaming, the gyoza release cleanly from the pan and are not sticking yet.
I was comfortable cooking protein in my cast iron pan. So I assumed gyoza would be no different.
I thawed some frozen dumplings and rinsed the wrappers under water to remove the excess flour. They stuck completely.
After cooking 70 more gyoza, I figured out what went wrong. There are four things that matter when cooking gyoza in a cast iron pan — heat, oil, moisture management, and the right tool.
The Four Key Points
The foundation of cast iron cooking is a shield — creating a state where food doesn’t directly bond to the metal surface. Heat and oil work together to create it.
For gyoza, two more factors come into play: moisture management to maintain the shield, and the right tool to act as a spear and break the bond when it’s time to release.
Heat + Oil — The Shield
A properly preheated pan instantly sears and sets the surface of the food the moment it makes contact. Oil gets between the food and the pan, preventing direct contact. Together, these two create the shield.
Without enough heat, the wrapper bonds to the pan before the surface has a chance to set. Too little oil exposes the metal surface and makes sticking more likely.
Moisture Management — Maintaining the Shield
Too much moisture lowers the pan’s temperature and weakens the shield. Use wrappers that are dry. After steaming, remove the lid and let the moisture evaporate completely.
The Tool — The Spear
The turner’s job is to slide its edge under the wrapper and break the bond between the gyoza and the pan. The thinner and harder the edge, the less force it takes to get under.
Silicone flexes and lacks a sharp edge. Wood is hard but thick and dull. Both fail to cut through the bond. The only tool that can is a thin, rigid stainless steel turner.
Why Gyoza Sticks to a Cast Iron Pan
Gyoza wrappers are made from wheat flour. When exposed to heat and moisture, the starch gelatinizes and bonds to the surface of the pan. Unlike protein, which contracts when heated and releases from the pan, starch does the opposite — the more heat and moisture it gets, the more it sticks.
In practice, the gyoza didn’t stick before the steaming water was added. The moment moisture entered the pan, they started to bond. That explains the first failure. Rinsing the wrappers added excess moisture before cooking even started.
Gyoza Is Meant to Stick — and Then Be Released
The crispy texture of pan-fried gyoza comes from gelatinized starch. As the gelatinized starch loses moisture and sets, it creates that signature crunch. Sticking, in other words, isn’t the problem. It’s what makes gyoza crispy.
What matters is the quality of the bond.
When the shield is working and gelatinization begins after the steaming water is added, there’s already a seared layer between the wrapper and the pan. The bond stays on the surface. Once the moisture evaporates, the gyoza can be released with a turner.
When the wrapper is wet from the start, the shield weakens. The starch bonds directly to the metal surface. By the time it sets, the bond is too strong for even a stainless steel turner to break.
This is what seems to be happening — though it’s hard to say for certain.
Wrapper Texture Changes Everything
I tested two types of gyoza — fresh and frozen — and the results were the same either way. What mattered wasn’t fresh versus frozen. It was the wrapper.
Gyoza with firm, low-moisture wrappers were straightforward. Even if they stuck a little, a gentle push with a silicone turner was enough to release them. The wrappers stayed intact. Clean results.
Firmer, lower-moisture wrappers hold much less excess flour.
Gyoza with soft, high-moisture wrappers were a different story. They stuck more, the edges would release but the center stayed bonded, and the act of releasing them was itself enough to tear the skin.
Soft, high-moisture wrappers tend to hold onto excess flour.
The wrappers tend to tear in the center where moisture is highest.
Nicely browned, but three wrappers tore.
A silicone turner couldn’t get under the wrapper or the crispy edges. I tried more oil. I tried hot water instead of cold for steaming. Nothing changed. Even with heat, oil, and moisture well managed, the final act of releasing the gyoza was the hardest part. That’s where the tool makes the difference.
A stainless steel turner could slide under where silicone couldn’t. With force concentrated at the edge and minimal resistance, it got under the wrapper without tearing it. The moment I switched turners, the struggle was over.
A thin stainless steel turner can slide under the wrapper and break the bond with the pan.
A flexible silicone turner bends easily and cannot break the bond between the gyoza and the pan.
How to Cook Gyoza
Preheat the pan
Heat over medium until just before it starts to smoke. If you see a faint wisp of smoke, lower the heat slightly.
Add oil
Swirl to coat the entire surface, with just a little left over. For a 26cm pan, about 1/2 to 1 tablespoon. When the pan is properly preheated, the oil will spread quickly and smoothly. As the pan becomes more seasoned over time, less oil will be needed.
Add the gyoza
Place them flat side down. Cook until the bottoms are lightly golden. Lower the heat slightly here to avoid burning while the first pieces are still going in.
Add water
Pour in enough to reach about 1/4 to 1/3 of the height of the gyoza. For crispy wings, mix in a little potato starch or flour.
Cover and steam
Cover with a lid and steam until most of the water has evaporated.
Remove the lid and dry the pan
When you hear a crackling, sizzling sound, remove the lid and let the remaining moisture evaporate completely. Cook until the wings and edges of the gyoza are golden. Adding a small drizzle of oil at this stage seems to make them crispier, though it’s not necessary. Medium to low heat is safer here — high heat makes it easy to burn.
Release and plate
Slide the turner under the wrapper and crispy edges, and release the gyoza carefully.
No tearing with soft, high-moisture wrappers.
Final Thoughts
At first, I was looking for a way to cook gyoza without it sticking. Maybe a professional cook could pull that off. But for an amateur like me, it wasn’t happening.
So I changed my approach. I accepted that gyoza is a food that sticks — and focused on keeping the bond as weak as possible through heat, oil, and moisture management, then relied on the right tool to finish the job.
The moment I switched to a stainless steel turner, the gyoza that had given me so much trouble came off the pan cleanly. It might not be the perfect method. But for me, it was enough.
Gyoza cooked in cast iron has a flavor and crispiness that other pans can’t quite match. I think it’s worth the effort.
A thicker, fluffier tamagoyaki cooked in an iron pan.
The River Light tamagoyaki pan is a Japanese rectangular iron pan designed for making rolled omelettes. Its shape helps create evenly thick layers with clean edges. It’s also handy for preparing small meals for one or two people, making it quite versatile.
Then I came across reviews saying that tamagoyaki made in this pan turns out thicker and fluffier than usual, which made me curious enough to give it a try.
Key Details
Made in Japan Each pan is made in River Light’s own factory in Japan, with care from skilled craftsmen.
Materials Uses steel manufactured by Japanese steelmakers only, with strict control over the raw materials used.
Rust-resistant Thanks to a special heat treatment, it is far more resistant to rust than ordinary iron pans, even without coating.
Easy to start using No initial high-heat burning process needed. After simple oil seasoning, it can be used right away.
Made to last The pan itself is solidly made, and the handle and fixing parts can be replaced if they wear out.
Handle The wooden handle fits comfortably in the hand and stays cool during cooking.
Size Three sizes available — extra small, small, and large. General guidance suggests 2–3 eggs for the small size, but I find it works well with 3–4 eggs. Egg size may make a difference — I usually use medium-sized eggs in Japan.
Heat sources Compatible with all heat sources, including IH (200V).
What It’s Like to Use
The high heat retention of the iron keeps the surface hot even after adding the egg. This allows the outside of each layer to set quickly, preserving the moisture inside before it has a chance to evaporate — which is likely why the tamagoyaki turned out thicker, fluffier, and juicier than I expected, just like the reviews said.
With a non-stick tamagoyaki pan, I used to add extra oil partway through to prevent sticking. With this pan, the initial oil was enough — no need to add more. That also means the finished tamagoyaki feels a little lighter and less oily.
Since I already use the River Light 26cm frying pan, the technique is exactly the same — no learning curve. And because of the smaller size, it heats up faster too. The one difference: because the sides of the pan come into play, it helps to coat them with oil as well — it keeps the edges clean.
And despite being called a tamagoyaki pan, it’s surprisingly versatile. I use it for fried eggs, sausages, dumplings, and simple breakfasts for one or two people.
When I started cooking tamagoyaki in a cast iron pan, I wasn’t sure which turner to use.
Wood seemed like it would wear down quickly and might be too thick to slide under eggs. Silicone felt like it might melt under high heat. And stainless steel — I’d read reviews saying it would scratch the pan.
After some hesitation, I went with stainless steel anyway. It turned out to be the right call.
Wood Turner
Wooden turners feel gentle. They don’t scratch the surface, feel warm in the hand, and never get too hot even while cooking.
But over time, they absorb oil and moisture. They take longer to dry and can hold onto smells or stains.
The edge is also a bit thick. As the wood fibers wear down, it becomes slightly rounded. Because of that, it can be harder to slide under food.
Silicone Turner
Silicone tools are often seen as safe. They don’t scratch the surface and are easy to clean.
Most are heat-resistant, so they won’t melt during normal cooking. But with cast iron, the heat can go higher than expected. I found myself hesitating to keep the turner against a hot pan for too long — worried about the silicone degrading or leaving residue in the food.
With use over time, the edge loses its sharpness, which makes it harder to slide under food cleanly.
And when trying to lift heavier food or scrape something stuck to the pan, the flexibility works against you — it bends when you need it to hold firm.
The silicone turner bends — and won’t slide under the gyoza.
Stainless Steel
It’s firm, thin, and direct. The edge slides in cleanly, and it’s easy to lift and fold. It doesn’t absorb oil or retain odors, and it dries quickly after washing.
Even when food didn’t come off easily, I could keep the edge against the pan without worrying about it losing its shape.
I used it for gyoza, and it was able to slide under the wrapper even when the skin was stuck flat against the pan — without leaving any visible marks on the surface. This was my biggest concern going in, and it turned out to be a non-issue.
Where to Buy
This is the turner I use. It ships from Japan, so it may not be the most convenient option for everyone — but if you’re looking for something similar, a thin stainless steel turner with a firm edge should work well.
I wanted to replace my plastic jug, so I started looking for a glass water jug for daily use. Something easy to clean and comfortable to use. This is the one I’ve been using.
Why HARIO
HARIO has been making heatproof glass in Japan since 1921 — starting with laboratory glassware, where precision and quality were everything. That same standard carries through to their everyday products today.
Why I Chose This Jug
Made in Japan Crafted in Japan with care and quality you can trust.
Materials Made from simple, refined natural materials. No heavy metals are used. Just clean, pure glass.
Heat-resistant You can pour boiling water directly into it.
Easy to clean The lid can be taken apart and washed easily. The simple structure makes it easy to keep clean, and it’s also dishwasher-safe.
Fits in the fridge door It fits neatly in the refrigerator door pocket, and the handle makes it easy to take out.
What It’s Like to Use
I mainly use it for barley tea and hatomugi tea, keeping it in the fridge and drinking it over a few days. Even after a few days, the color and flavor stay clear and fresh. Since the jug is made from 100% natural materials, I feel comfortable leaving tea inside it.
The best part is how cleanly it pours — no drips at all. When pouring, I usually hold the lid or remove it.
It also fits exactly one kettle of water, so I can transfer it straight to the jug as soon as it boils.
I usually cook with a regular iron pan. As I got more used to it, I found myself wanting to try something a little more demanding. Because tamagoyaki (Japanese rolled omelette) is thin and delicate, I was curious how it would turn out.
First Use
I heated the pan thoroughly — sometimes just before it started to smoke — then lowered the heat to medium-low.
I added a thin layer of oil, enough to coat the surface, and poured in a small amount of egg mixture.
Pouring a small amount of egg and spreading it thinly.
As I rolled the thin layers, the eggs released easily from the pan, with just a light push from the chopsticks.
When I used to make tamagoyaki with a non-stick pan, I would often add more oil along the way. But this time, even without adding more oil, nothing stuck until the end.
Cooking in thin layers, keeping the inside soft and slightly runny.
The mixture also contained sugar, and since the pan was well heated, I expected some sticking or burning.
But that didn’t happen at all.
Finished tamagoyaki, with the pan still clean after cooking.
Why It Felt Easier
It may be because of the pan’s heat retention that it felt easier to cook with. Even after adding the eggs, the temperature didn’t drop much, so the surface set quickly. Because of that, the layers could be rolled smoothly without sticking or breaking.
With proper preheating, the heat stays in the pan, allowing it to cook steadily even over low heat. That may be why nothing burned, and the eggs turned out soft and juicy.
The pan I used here is the River Light tamagoyaki pan. You can read more about it here. → River Light Tamagoyaki Pan review
It turned out easier than I expected, and the result was better than I imagined. I was genuinely happy with it, and I’d like to keep making it this way.
I’ve been gradually replacing my plastic containers with glass ones. For something I use every day, I wanted something comfortable to use. These are the ones I chose.
Why HARIO
HARIO has been making heatproof glass in Japan since 1921 — starting with laboratory glassware, where precision and quality were everything. That same standard carries through to their everyday products today. The name itself means “King of Glass,” and they live up to it: all glass is made from 100% natural minerals, and since 1972, their factory has operated without smokestacks — a commitment to the environment that was well ahead of its time.
What It’s Like to Us
I use them throughout the day, in different sizes — the smaller ones for rice or dipping sauces, sometimes for biscuits or chocolate with tea.
Biscuits in a small glass container, with a HARIO mug.
The medium size works well as a salad bowl or rice bowl, and the larger rectangular ones are useful for fish dishes.
Ingredients prepped in HARIO glass containers before making fried rice.
I like that I can place them directly on the table and use them as they are.
Unlike plastic, I can heat them straight in the microwave without transferring to another dish, and they don’t absorb odors or stains.
They also feel solid and durable. I sometimes knock them lightly while washing or drying, but I haven’t had a single one break. On busy days, it helps that I can just use them without thinking too much.
A tawashi is a traditional Japanese scrubbing brush used for cleaning cookware, vegetables, and kitchen tools.
The oval-shaped Kamenoko tawashi was invented in 1907 by Nishio Shoten in Tokyo, and is still widely used today.
Kamenoko tawashi literally means “baby turtle tawashi.” The oval shape was said to resemble a small turtle.
How it differs from Western scrubbers
In many Western kitchens, natural fiber brushes are used too — but they tend to be purpose-specific. A vegetable brush for produce, a dish brush for cookware, a nail brush for hands.
A tawashi is a little different. One brush can move from cast iron pan to root vegetables to sink drain — without skipping a beat.
That versatility, combined with its durability, is what has kept it in Japanese kitchens for over a century.
Types of tawashi
Kamenoko Tawashi and Karukaya Tawashi
Palm (coconut fiber)
The firmest and most durable. Firm, springy fibers remove burnt-on residue and oily buildup from iron plates and grills.
Shuro (palm bark fiber) Balanced in firmness, with resilient yet flexible fibers. Gentle on surfaces, it cleans without scratching. Suitable for glass, ceramics, and non-stick pans.
Sisal The softest fibers among the four. Gently wipes away residue rather than scraping it off. Suitable for non-stick pans, plastic containers, sinks, and bathtubs.
Karukaya
Thick, firm, and durable fibers that don’t absorb oil easily. Removes burnt-on and stuck-on food from cast iron pans. Dries quickly after use.
How to Use Tawashi
I mainly use a karukaya brush for my cast iron pan. Because it’s made from natural fibers, it doesn’t strip away too much of the oil layer, and it’s less likely to scratch the surface.
Its slim shape also makes it easy to hold.
Pots and pans are often washed with just water and a tawashi.
For root vegetables such as burdock and potatoes, I use the oval-shaped tawashi. The firm fibers help remove dirt effectively, and using natural materials feels more suitable for something that comes into direct contact with food.
A tawashi is perfect for cleaning soil-covered vegetables like burdock root.
Tawashi are also useful beyond the kitchen.
They work well for cleaning stove grates, drains, shoes, and even outdoor surfaces. Because they are durable and versatile, they rarely get thrown away after kitchen use — they simply move on to the next job.
