The standard pizza topping is strained, highly seasoned Italian plum tomatoes, covered with slices of mild Mozzarella cheese, with a sprinkling of olive oil and grated Parmesan cheese for flavor. But a pizza may also include almost any garnish a pizza maker can dream up: anchovy fillets(Neapolitans insist on them): sliced onions or mushroom chopped salami or pepperoni: crumbled sausage or meat balls, and many more