Cast iron earns its place through heat retention and a natural nonstick surface called seasoning. It heats slowly and a little unevenly, but once hot it holds that heat better than almost anything — ideal for searing steaks, baking cornbread, and anything that benefits from steady, high heat.
Seasoning is the key
Seasoning is a layer of polymerized oil baked onto the iron, building up over time into a slick, protective coating. To maintain it, cook with some fat, and after cleaning, wipe a thin layer of oil onto the warm pan.
Care, minus the myths
You can use a little mild dish soap — modern soap won’t strip a good seasoning. What actually harms cast iron is soaking, the dishwasher, and trapped moisture, which cause rust. The routine: clean while warm, dry immediately and thoroughly (a quick pass over a low burner helps), then re-oil lightly. Avoid cooking very acidic foods for long periods early on, as acid can eat into fresh seasoning.
Frequently asked questions
Can I use soap on cast iron? A little mild soap is fine; just don’t soak it or use the dishwasher.
Why did my pan rust? Trapped moisture — always dry it fully and re-oil.
How do I keep it nonstick? Cook with fat and re-oil after cleaning to build seasoning.