A pizza grilling stone allows you to bake a pizza on your propane or charcoal grill to impart a slight smoky flavor, just like pizzas made in an authentic wood-fired pizza oven. Another benefit is you can make a pizza without turning on an indoor oven on those days when the air conditioning is running nonstop. Stones are often made from clay, marble, tile, or firebrick and range in thickness from ½ an inch to a full inch. For the best results, preheat your stone for 30 minutes before cooking. After its hot, it will retain its heat for a long time, which helps when cooking multiple pizzas. You can extend its lifespan by seasoning it regularly with oil.