A burger is a sandwich consisting of a cooked patty of ground meat usually placed inside a sliced bread roll. Burgers are often served with lettuce, bacon, tomato, onion, pickles, cheese and condiments such as mustard, mayonnaise, ketchup and relish. Burgers are often served as a fast dinner, picnic or party food, and are usually cooked outdoors on barbecue grills. Learn how to make burger by following this easy recipe. Enjoy!