The Birth of The Burger:

The name hamburger is nothing to do with ham, but comes from the German city of Hamburg. A burger was originally called a Hamburg steak, in 1889, the word Hamburg first appeared in a restaurant review in the US newspaper Walla Walla Union. It was in a phrase that was itself a mouthful: "You are asked if you will have pork chop beef steak ham and egg hamburger steak or liver and bacon."