KC Butt Sauce BBQ Sauce for Pork, Beef, and Poultry - 21 Ounce Bottle KC Butt Sauce is a championship barbecue sauce that's made with brown sugar, apple cider vinegar, and a blend of zesty spices. Mop it on your pork, beef, or poultry just before taking it off the grill or smoker to give your meats that championship flavor.