100% certified Angus beef patty, 21 sauce, choice of cheese, lettuce, vine-ripened tomato, toasted brioche bun with a side of B21 house chips. 819-879 cal. Choose a meat preparation: Rare, Medium Rare, Medium, Medium Well, Well Done. Choose a cheese: American Cheese, Cheddar Cheese, Swiss Cheese. Choose a side: B21 House Chips, Substitute French Fries (336 Cal), Substitute Sweet Potato Fries (490 Cal) : $0.50. Would you prefer a bun substitution?: Substitute Lettuce Bun. Would you like add ons?: Add Ketchup, Add Mustard, Add Mayonnaise, Add Honey Mustard, Add BBQ.