What is bk stacker sauce?

The BK Stacker sauce is a creamy, tangy condiment that is used on Burger King's popular BK Stacker sandwich. The sauce is a special blend of mayonnaise, ketchup, and a selection of spices that give it a unique flavor profile. It adds a satisfying kick to the sandwich, which features multiple beef patties, cheese, bacon, and other toppings. The BK Stacker sauce is not available for purchase on its own, but it can be enjoyed by ordering the BK Stacker sandwich at Burger King locations.