1/4 c. vinegar
2 tbsp. sugar
1 1/2 tsp. black pepper
1 sliced onion
1/2 c. ketchup
1/2 c. water
1 tbsp. mustard
1/2 c. butter
1/2 tsp. (dash) cayenne pepper
2 tbsp. Worcestershire sauce

Mix above except ketchup and Worcestershire sauce. Simmer uncovered for 20 minutes. Then add ketchup and Worcestershire sauce. Bring to a boil, turn off heat. For a thicker, smoother sauce, let cool. Then blend or puree in blender.