Louis Lunch is a Yale tradition dating back to 1895.   Some say they may have invented the hamburger.

The burger is worthy of its history.  Loose packed ground beef broiled a perfect medium rare, a slice of grilled onion, a slice of tomato, and slathers of melted cheddar on both pieces of toasted bread.

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The broilers are ancient.  And unique.  The burgers go between wire griddles, slice into the broiler and broil vertically.