From our Friends at VegetarianTimes.com
New cast iron cookware will usually be seasoned already. But if you want to rehabilitate a yard-sale find, Grandma’s old skillet or the one you let get all rusty, here’s how.
Line oven rack with foil, and preheat oven to 350 degrees.
Clean skillet well with dish washing liquid, using steel wool to remove any rust spots or stuck on food. Rust can stain fabric so dry with an old towel or paper towels if you must.
Rub skillet inside and out with vegetable oil. Place in oven upside down on foil-lined rack, and bake for 1 hour. Turn off oven, and cool pan in oven before removing.
3 Tips for Keeping Your Cast Iron Skillet in Good Condition
Wash it with warm, soapy water – Never soak it, and never put it in the dishwasher.
Rub a small amount of vegetable oil all over the pan after each use.
Store pan in a dry, well-ventilated spot – such as the stove top.
Remember you can use your cast iron pan to saute, sear, braise, deep-fry & bake. You can use this versatile lady on the stove, in the oven and on the grill. Fun things to bake are deep dish pizza, corn bread and Spiced Mango Upside-Down Cake. Yum.