A hamburger, or simply a burger, is a dish consisting of fillings – usually a patty of ground meat, typically beef – placed inside a sliced bun or bread roll. The patties are often served with cheese, lettuce, tomato, onion, pickles, bacon, or chilis with 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. Under some definitions, and in some cultures, a burger is considered a sandwich.