Limited menu includes the ShackBurger, a single or double cheeseburger topped with lettuce, tomato and ShackSauce; 'Shroom Burger, a fried portobello mushroom filled with melted Muenster and Cheddar cheeses, topped with lettuce, tomato and ShackSauce; Shack Stack, which includes both a cheeseburger and 'Shroom Burger topped with lettuce, tomato and ShackSauce; fries; hot dogs; milkshakes; and a "Concrete" dessert known as the Brotherly Love Crunch (vanilla custard with malt powder, Valrhona crunchies, and chocolate toffee).