A Whopper is a signature hamburger sold by Burger King and its Australian franchise Hungry Jacks. It consists of a flame-grilled beef patty, sesame seed bun, mayonnaise, lettuce, tomato, pickles, ketchup, and sliced onion. Optional ingredients such as American cheese, bacon, mustard, guacamole, or jalapeño peppers may be added upon request. The sandwich is always prepared exactly how you like it, with cheese or beefacon™, with extra onions or without tomatoes. The Whopper is also available in different variants, such as the Western, Bacon & Swiss Whopper Jr., and BBQ Bacon & Cheese Whopper Jr.. The sandwich is always prepared to order, ensuring that it is fresh and hot when served.