Steps

1. For crusty cast ironware that you inherited or picked up at a garage sale: Your cookware may have some combination of rust and thick crackly black crud. It can be restored fairly easily to good as new condition! First place the cookware in a self-cleaning oven and run one cycle OR place in a campfire or directly on a hot charcoal fire for 1/2 hour, until dull red. The crud will be flaking, falling and turning to white ash. Then follow the following steps.
2. Wash your cast iron cookware with warm water and soap using a scouring pad. If you have purchased your cast iron cookware as new then it will be coated in oil or a similar coating to prevent rust. This will need to be removed before seasoning so this step is essential.
3. Dry the cookware thoroughly.
4. Coat the pot or pan inside and out with lard, Crisco, bacon fat, or corn oil. Ensure that the lid is also coated.
5. Place both the lid and the pot or pan upside down in your oven at 300F for at least an hour to bake on a “seasoning” that protects the pan from rust and provides a stick-resistant surface.
6. For best results repeat steps three and four.
7. Ongoing care: Every time you wash your pan, you must season it. Place it on the stove and pour in about 3/4 tsp. corn oil or other cooking fat. Wad up a paper towel and spread the oil across the cooking surface, any bare iron surfaces, and the bottom of the pan. Turn on the burner and heat until smoke starts to appear. Cover pan and turn heat off.