The term Hamburger originally derives from the German city of Hamburg Germany's second largest city, from where many emugrant came to America.Hamburgers may be cooked in a variety of ways, including pan-frying, barbecuing, and flame-broiling. Hamburgers are often served with lettuce, bacon, tomato, onion, pickles, cheese and condiments such as mustard, mayonnaise, ketchup, relish, and chiles.