Different geographical regions have allegiances to their particular styles and variations for barbecue sauce. For example, vinegar and mustard-based barbecue sauces are popular in certain areas of the southern United States, while in the northern U.S. tomato-based barbecue sauces are well-known. In Asian countries a ketchup and corn syrup-based sauce is common. Mexican salsa can also be used as a base for barbecue sauces