Which fast-food franchise introduced the Whopper hamburger in 1957?

Burger King introduced the Whopper hamburger in 1957.

The Whopper was created as a large hamburger intended to distinguish Burger King from competing quick-service restaurants. It became the chain’s signature product and remains one of the most recognizable menu items in franchise fast food. The original burger included a flame-grilled beef patty and toppings served in a sesame-seed bun.

The product’s name is sometimes confused with the date Burger King itself was founded or with the opening of its first restaurant. Those are separate milestones. The Whopper was introduced several years after the company began operating and became central to Burger King’s advertising and brand identity.

Burger King’s flame-broiling method also helped differentiate the chain from restaurants using flat-top griddles. Although ingredients and promotional versions have changed over time, the Whopper has remained the company’s best-known flagship sandwich.