Burger King’s Steakhouse Bacon Whopper® features a ¼. lb.* flame-grilled beef patty, topped with crispy bacon, juicy tomatoes, crisp lettuce, melty Swiss cheese, and finished with signature steakhouse favorites – A.1. Sauce, Crispy Onions , and Creamy Peppercorn Aioli. *Weight based on pre-cooked patty.