What is in barbecue sauce?

Most people have their own mixtures for their sauce. Here are some of the items often used in making a sauce. Green bell pepper (seeded and chopped), olive oil, onion (chopped), garlic (minced or garlic powder), dry mustard, brown sugar, catsup, red pepper flakes, cloves, Worcestershire sauce, vinegar (cider, wine or malt, I have see one BBQ maker use dill pickle juice), molasses or honey, peppers (chopped), liquid smoke, soy sauce, tomato (sauce or paste), salt, pepper, and their secret spices which are usually common spices in the kitchen such as cummin, spiced salt, chili powder, paprika or what ever one might like. Most BBQ joints have their own which was developed after many years of testing.