When using a built-in pizza oven, it's recommended to use a pizza stone or pizza peel. A pizza stone helps to distribute heat evenly and prevents the pizza from sticking to the oven surface. It also helps to create a crispy crust. A pizza peel, on the other hand, is used to transfer the pizza in and out of the oven. It allows you to easily slide the pizza onto the stone and remove it once it's cooked.