What are the common misunderstandings about looking after an iron frying pan?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Iron frying pans are enjoying a worldwide revival, but many people give up because "it rusts" or "everything sticks." In Japan, two routines — "abura-narashi" (油ならし, seasoning) and "abura-gaeshi" (油返し, pre-oiling before each use) — are well established. Once you know them, the pan lasts for years.
The routine
| Situation | What to do |
|---|---|
| First use (abura-narashi, seasoning) | Wash and dry → heat empty over a medium flame to burn off the anti-rust coating (depends on the product) → add a generous amount of oil and heat on low for 5 minutes → pour off the oil and wipe. Frying vegetable scraps reduces the iron smell |
| Every time, before cooking (abura-gaeshi) | Heat over a medium flame, add a generous amount of oil and swirl it over the whole surface → pour the excess back into a pot → cook |
| After cooking | Wash while still hot with hot water and a scrubbing brush (tawashi) (a little detergent is fine) → put it on the heat to drive off every trace of water → rub in a thin coat of oil |
| If it rusts | Scrub off with a metal scourer or scouring powder → season again |
| If food burns on | Fill with hot water, bring to the boil, let it soften and scrape off |
- An iron pan holds a stable high surface temperature, so it suits searing and stir-frying. But simmering strongly acidic dishes (tomato, vinegar) for a long time leaches iron, affecting both the flavour and the surface.
- Some people hope for extra dietary iron, but the amount of iron released in cooking varies greatly with the dish and the time, and it cannot be counted on as a nutrient source.
[Verify] The routine is a general method based on the instruction manuals of major makers; it varies by product (whether there is an anti-rust coating, nitriding treatment, etc.).
Misunderstanding 1｜Detergent strips the whole oil film
A baked-on oil film (polymerised oil) does not come off to any great degree with detergent. If you are worried, hot water and a tawashi alone are enough. Re-oil after washing with detergent and there is no problem.
Misunderstanding 2｜Food sticks because the pan is iron
The main cause is not enough heat. Heat the pan properly, then swirl the oil (abura-gaeshi), and food sticks far less. Cold food into a cold pan sticks worst of all.
Misunderstanding 3｜Once it rusts, it is finished
Rust can be removed. Scrub it off with a metal scourer, season again and the pan comes back. Unless the rust has eaten holes in the surface, it is usable.
Misunderstanding 4｜No need to dry it after washing — oil stops rust
Oil over remaining water means rust forms under the oil. The order is put it on the heat and drive off every trace of water first.
Misunderstanding 5｜Iron pans are too heavy to handle
A thin pan of around 1.6 mm plate weighs little more than a fluoropolymer-coated aluminium pan of the same size. Thick ones (2.3 mm and up) store more heat and suit steak and gyoza — a way of choosing shared among people living in Japan.
---
Sources
- Consumer Affairs Agency, "Household Goods Quality Labelling Act — Quality labelling rules for miscellaneous industrial goods (pots and frying pans)" [家庭用品品質表示法 雑貨工業品品質表示規程（なべ・フライパン）]
https://www.caa.go.jp/policies/policy/representation/household_goods/guide/zakka/
- Japan Metal Houseware Industry Association [一般社団法人日本金属ハウスウェア工業組合], "Caring for cookware" [調理器具のお手入れ]
https://www.jmhia.or.jp/
- Ministry of Health, Labour and Welfare, "Dietary Reference Intakes for Japanese (2025 edition)" [日本人の食事摂取基準（2025年版）] (recommended iron intake)
https://www.mhlw.go.jp/stf/newpage_44138.html
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
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