What is double whopper?

Double Whopper is a type of hamburger usually available in Burger King outlets across the world. It comprises two beef patties, lettuce, tomato, pickles, white onion, ketchup, mustard, and mayonnaise. The buns used for the Double Whopper are sesame seed buns. The average number of calories in a Double Whopper is around 900-1000, depending on the specific ingredients used. The Double Whopper first appeared on the Burger King menu in the late 1990s and has since been a popular item among Burger King fans.