Four generations of the Lassen family have been running this diner continuously since 1895, making Louis’ the oldest burger joint in the nation. The creation story goes like this: One day in 1900 a customer asked for a quick meal to go, so Louis piled some ground-steak trimmings on toast for him–and made history. Be forewarned: you won’t find any condiments–just toppers such as onion, tomato, and cheese. 261-263 Crown St., New Haven. 203-562-5507; louislunch.com
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