How to "Cure" A Cast Iron Skillet
Things You'll Need
Instructions
1Preheat the oven to 250 degrees F. Wash the new cast iron skillet in warm, soapy water. Dry it off gently using paper towels.
2
Rub an even layer of lard or shortening into the entire cooking surface of the skillet. Then place the greased skillet in the oven for one hour.
3
Remove the skillet from the oven. Carefully rub additional shortening into the pan. Replace in the oven for one hour.
4
Remove the skillet from the oven and allow the pan to cool. It is now cured, or seasoned, and ready for use.
Source...