Louis’ Lunch is recognised by the Library of Congress as the birthplace of the hamburger. The burgers are still served as they were in 1895, and they look a little bit different than the burgers in a bun that most modern restaurants serve. An Original Burger is made with five different cuts of meat, ground fresh, and served on toasted white bread. They’re topped simply, with just cheese, onion and tomato.

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Now read more about America's classic burger recipes (including some you may not have heard of)

Last updated by Natasha Lovell-Smith.

Ranked: America's old-school burger joints where the recipes never change