Pizza (pronounced /ˈpiːtsə/ listen , in Italian: ) (also occasionally called "pizza pie" in certain parts of the United States) is the name of an oven-baked, flat, usually round bread covered with tomato purée and often mozzarella cheese, with other toppings left optional. While originating as a part of Neapolitan cuisine, the dish has become popular in many different parts of the world. A shop or restaurant where pizzas are made and sold is called a "pizzeria" (from Italian) although the phrase "pizza parlor" is also used in the United States and Canada.Various toppings may be added, most typically:sauce, traditionally tomato-based but pesto, alfredo, barbecue sauce, and occasionally even ketchup are also used;cheese, usually mozzarella but also provolone or a blend of other cheeses;herbs and seasonings such as basil, oregano, and garlic;vegetables such as artichoke hearts, bell peppers, eggplant, olives, onions, and spinach;meat, such as sausage (pepperoni, salami or Italian sausage), ham, bacon, ground beef, and chicken, or seafood such as anchovies, tuna, and shrimp;Other common toppings include mushrooms, tomatoes, and pineapple.In some pizza recipes the tomato sauce is omitted (termed "white pizza"), or replaced with another sauce (usually garlic butter, but sauces can also be made with spinach or onions). In the Philadelphia area there are also tomato pies — sauce only, or sauce with ripe Roma tomatoes and spices but no cheese — and upside-down pizzas, i.e., the cheese on the bottom and topped with sauce. Pizza is normally eaten hot (typically at lunch or dinner), but is sometimes eaten as cold leftovers.