Season that Cast Iron! It’s easier than you think. Just preheat your oven to 325°F. Wash (with dishwashing soap) and dry your pan. Using a paper towel or clean cloth, apply a coat of vegetable oil over the entire pan, inside and outside, handle, bottom, all of it. Place the pan in your heated oven for 1 hour. Turn the oven off, leave the pan inside until it is cooled. That’s it!