define hamburger
A hamburger (also called a beef burger, hamburger sandwich, burger, hamburg or cheeseburger when served with a slice of cheese) is a sandwich consisting of one or more cooked patties of ground meat, usually beef, placed inside a sliced bun.he bun has mayonnaise, ketchup and mustard. In certain parts are served with bacon, which can be fried or grilled along with the meat patty. A slice of pineapple is also a usual option, and the variation is known as a Hawaiian hamburger.