Cast iron cookware has been used in kitchens for centuries, and for good reason. A well-seasoned cast iron skillet or Dutch oven distributes heat evenly, retains temperature beautifully, transitions from stovetop to oven without issue, and develops a naturally non-stick surface over time. Most remarkably, a cast iron pan that is properly cared for does not just last a lifetime — it improves with age and use. Skillets that belonged to grandparents and great-grandparents are still producing exceptional food today.
The key to this longevity is understanding how cast iron works and what it actually needs from you. Once you grasp the basics, cast iron becomes one of the lowest-maintenance items in your kitchen.
What Seasoning Actually Means
Seasoning refers to the layers of polymerised oil that bond to the surface of the iron and fill its microscopic pores. When oil is applied to cast iron and heated past its smoke point, the oil molecules break down and bond to the iron surface, forming a hard, plastic-like coating that is slick, dark, and remarkably non-stick. This is not a coating applied in a factory — it is something you build up yourself over time through use and occasional re-seasoning, and it improves the more you cook with the pan.
A brand-new cast iron pan from a reputable manufacturer will usually come with a factory seasoning — a thin initial layer of oil baked on at the factory. This is enough to get started, but the pan will perform better and better as more cooking builds up the layers. Pans inherited from relatives often have decades of built-up seasoning that makes them extraordinarily non-stick.
How to Season Cast Iron Step by Step
To season a cast iron pan — either for the first time or to restore one — start by washing it thoroughly with hot soapy water (this is one of the few times soap is appropriate on cast iron) to remove any factory coating, rust, or old residue. Dry it completely, then place it on a burner over medium heat or in a hot oven for five minutes to drive off all remaining moisture. Once completely dry, apply a very thin, even coat of a high-smoke-point oil all over the entire pan — inside, outside, and the handle. Flaxseed, grapeseed, and vegetable shortening are popular choices. Use a cloth or paper towel to wipe off as much oil as you think is reasonable, then wipe off a little more. You want the thinnest possible film, not a wet coating — too much oil at once produces a sticky, uneven layer that never bonds properly.
Place the pan upside down in an oven preheated to around 200°C (400°F). Put a sheet of foil on the rack below to catch any drips. Bake for one hour, then turn the oven off and allow the pan to cool inside the oven. Repeat this oiling-and-baking process three to four times to build up an initial solid seasoning before cooking in the pan.
What to Cook in Cast Iron (and What to Avoid)
Cast iron excels at high-heat searing — steaks, burgers, and chicken thighs develop a beautiful crust in a hot, well-seasoned cast iron pan in a way that stainless steel and non-stick simply cannot replicate. It is also ideal for frying, roasting, baking cornbread, making frittatas, and cooking anything that starts on the stovetop and finishes in the oven. The superior heat retention of cast iron makes it particularly good for maintaining a consistent temperature when cooking proteins.
Avoid cooking highly acidic foods in cast iron for extended periods — tomato-based sauces, wine reductions, and citrus-heavy dishes can strip the seasoning if left to simmer for long periods, and the iron can leach into acidic food, imparting a metallic taste. Quick deglazing with wine or a splash of tomato is generally fine; long braises with acidic ingredients are better done in enamelled cast iron or stainless steel.
How to Clean Cast Iron After Cooking
The most persistent myth in cast iron care is that you must never use soap. This is a holdover from an era when soaps contained lye, a caustic alkali that does strip seasoning. Modern dish soap is mild and will not damage a well-seasoned cast iron pan when used occasionally. That said, for everyday cleaning, soap is completely unnecessary. While the pan is still warm (not scalding), use a stiff brush or a chainmail scrubber with hot water to remove any food residue. Rinse thoroughly, then immediately dry the pan completely — either with a towel or over low heat on the stovetop for a few minutes. While the pan is still slightly warm, apply a very thin wipe of oil all over the cooking surface and buff it in with a cloth. This maintains the seasoning with every wash.
Restoring a Rusty Cast Iron Pan
Rust on cast iron is not a death sentence — it is fully reversible. A lightly rusted pan can often be scrubbed with coarse salt and a cut potato, which acts as a gentle abrasive. For more extensive rust, use steel wool or coarse sandpaper to scrub away the rust completely, wash and dry the pan thoroughly, then re-season it from scratch using the baking method described above. Deeply rusted pans can be soaked in a fifty-fifty solution of white vinegar and water for no more than thirty minutes, then scrubbed clean. Avoid longer soaking — extended vinegar exposure can begin pitting the iron itself.
Storing Your Cast Iron
Store cast iron in a dry place. If stacking multiple pieces, place a paper towel or cloth between them to allow air circulation and prevent moisture trapping. In humid climates, storing cast iron in a slightly warm oven with the pilot light on, or with a silica gel packet nearby, helps prevent rust forming between uses.
Cast iron asks very little from you: dry it completely after washing, give it an occasional wipe of oil, and use it often. In return, it will cook your food better, improve over years of use, and outlast every other pan in your kitchen by several decades. A cast iron skillet is genuinely one of the best long-term investments you can make in your cooking equipment.
