The signature burger at Key & Cleaver uses a thick beef patty, usually cooked medium, layered with cheese, lettuce, tomato, and house sauces on a toasted bun, and often served with fries.[9] This burger is set apart by its focus on pairing with craft beer and the kitchen’s use of well-seasoned patties and house-made condiments.[9] When eating it, you get a balanced burger with a juicy center, crisp exterior, and toppings that feel thoughtfully combined rather than overloaded.[9] Burger and bar guides note Key & Cleaver for its burger-plus-beer focus, suggesting this burger as a central part of the menu alongside other pub-style dishes.[9][6]