A cheeseburger is a hamburger topped with cheese. Traditionally, the
slice of cheese is placed on top of the meat patty. The cheese is
usually added to the cooking hamburger patty shortly before serving,
which allows the cheese to melt. Cheeseburgers can include variations in
structure, ingredients and composition. As with other hamburgers, a
cheeseburger may include toppings such as lettuce, tomato, onion,
pickles, bacon, mayonnaise, ketchup, and mustard.
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