1/2 lb beef burger are Summits signature blend of 100% sirloin and are Summitized with 21 spice Summits blend of seasonings always. Served on a brioche bun with fries. Sautéed mushrooms, caramelized onions, applewood smoked bacon, Swiss cheese, Cheddar cheese, ketchup, Dijon mustard, mayonnaise, lettuce, and tomato.