There are several types of BBQ sauce. Most traditional BBQ sauces either use tomato sauce, mustard, or vinegar as a base, and they come in all thicknesses. For instance, North Carolina barbecue sauce is thin and runny, while Kansas City barbecue sauces are thick and sticky.

There are also variations of sauces known as mopping sauces, which is regularly slopped all over the meat while it is cooking. Finishing sauce is used as a condiment when eating barbecue and is not used during the cooking process.

Link:
http://www.bbqrecipesecrets.com/bbqsauce.html

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