Hamburger, a transliteration of English hamburger, is a kind of food that originated in Hamburg, Germany, and was later introduced to the United States. After the improvement of Americans, American hamburgers are popular all over the world and are the main food in modern western fast food.

The earliest hamburgers were mainly composed of two buns and a beef pie. In modern hamburgers, besides beef patties or other patties (as long as they are fried or fried), there are butter, mustard, ketchup, salad dressing and so on. It is spread on the second layer of the bun, and then sandwiched with tomato slices, onions, vegetables, pickles and other foods, so that the main and non-staple foods can be eaten at the same time.