A Burger is a sandwich consisting of fillings—usually a patty of
ground meat, typically beef—placed inside a sliced bun or bread roll.
Burgers are often served with
cheese, lettuce, tomato, onion, pickles, bacon, or chilis; condiments such as ketchup, mustard, mayonnaise,
relish, or a "special sauce", often a variation of Thousand Island dressing; and are frequently placed on
sesame seed buns. A hamburger patty topped with cheese is called a cheeseburger.