The primary ingredient in traditional American barbecue sauce is tomatoes, usually in the form of tomato ketchup or tomato paste. This tomato base provides the sauce with its distinctive sweetness and tang, which is often complemented by a blend of ingredients such as vinegar, sugar, Worcestershire sauce, mustard, and various spices. Regional variations of barbecue sauce exist across the United States, each reflecting local preferences and cuisines. The sauce is typically used to marinate, baste, or dip grilled and smoked meats, enhancing their flavor and adding moisture.