A cast iron skillet is one of the few pans that gets better the more you use it and can outlast you if you treat it right. People overcomplicate the care, scared of ruining the seasoning. The truth is that cast iron is tough, and a few basic habits keep it in great shape.
What seasoning actually is
Seasoning is not a coating sprayed on at the factory. It is a layer of oil that has been baked onto the iron until it polymerizes into a hard, slick, naturally nonstick surface. Every time you cook with fat, you add to it. The black, glassy patina on an old pan is decades of this built up.
Daily care
- Clean it while it is still warm with hot water and a brush or scraper.
- A little soap is fine despite the old myth; it will not strip good seasoning.
- Dry it completely, then rub on a thin film of oil before storing.
The cardinal rule
The one thing cast iron truly hates is sitting wet, which causes rust. Always dry it thoroughly, ideally on a warm burner for a minute, then oil it lightly. If it ever rusts or the seasoning gets patchy, you can scrub it back and re-season by baking on thin coats of oil. Avoid long-simmering acidic things like tomato sauce in a pan with thin seasoning, since acid can eat at it. Otherwise, just cook in it often.