hamburgerbeefburger or burger is a sandwich consisting of one or more cooked patties of ground meat, usually beef, placed inside a sliced bread roll or bun. The patty may be pan friedbarbecued, or flame broiled. Hamburgers are often served with cheeselettucetomatobacononionpickles, or chilescondiments such as mustardmayonnaiseketchuprelish, or “special sauce“; and are frequently placed on sesame seed buns. A hamburger topped with cheese is called a cheeseburger.

The term “burger” can also be applied to the meat patty on its own, especially in the UK where the term “patty” is rarely used, or the term can even refer simply to ground beef. The term may be prefixed with the type of meat or meat substitute used, as in “turkey burger“, “bison burger”, or “veggie burger“.

Hamburgers are sold at fast-food restaurantsdiners, and specialty and high-end restaurants (where burgers may sell for several times the cost of a fast-food burger, but may be one of the cheaper options on the menu). There are many international and regional variations of the hamburger.