Any of the ingredients added over the pizza and the pizza crust. Often, a tomato sauce is spread over the crust and then one or several ingredients, such as cubed meats, ground meats, pepperoni sausage slices, Canadian bacon, Italian sausage, seafood such as anchovies or shrimp, vegetables such as peppers, or fruit such as pineapple, may be added as a topping. Cheese is generally the final layer of ingredients added on all pizzas.