Onion Burger (Oklahoma)
The Oklahoma onion burger is prepared by turning thin onion slices into beef patties. Meat and onions are cooked together until the onions are caramelized and crispy and the meat is fully cooked. The burger usually includes a slice of American cheese, pickles, and mustard or mayonnaise (or both), all topped with soft, fluffy buns.
It is believed that this burger was invented in the 1920s during the Depression when onions were very cheap and meat was expensive, so people started adding onions to meatballs.
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