Basic Barbecue Sauce

3 small cans tomato sauce
1/4 cup onion, minced
1/2 cup light brown sugar
1 tsp. white pepper
1/2 tsp. dry mustard
1 tsp. salt
1 Tbsp molasses
1 Tbsp corn syrup
1/4 tsp. cayenne pepper (optional)
1 garlic clove, minced
2-3 tsp. liquid smoke

Mix all ingredients and simmer in a medium size saucepan for an hour, stirring occasionally.