Louis' Lunch is a hamburger restaurant in New Haven, Connecticut, which claims to be the first restaurant to serve hamburgers and the oldest hamburger restaurant in the United States. It was opened as a small lunch wagon in 1895 and was one of the first places in the U.S. to serve steak sandwiches. According to Louis' Lunch, the hamburger was created in 1900 in response to a customer's hurried request for a lunch to go. In 1917, Louis moved the business into a square-shaped brick building that had once been a tannery.