Place your dry cast iron skillet
onto the grill rack. Preheat your grill to high heat and shut the lid. Ours got up to 700 degrees F. It should take at least 15 minutes. The higher the better! (If you are using a non-gas grill, set up two heating zones: one for high heat, and a separate zone for low heat.) Make sure the cast iron preheats as long as the grill, you need it super hot.