1 tbsp. butter
3/4 c. ketchup
1/3 c. lemon juice
2 tbsp. mustard
2 tsp. salt
3/4 c. chopped onion
3/4 c. water
2 tbsp. sugar
2 tbsp. Worcestershire sauce
1/2 tsp. pepper

Brown onion in butter. Mix mustard and ketchup together and add water in a bowl. Pour into pot with onions and add the rest of the ingredients. Simmer. If you desire a thicker BBQ sauce you can add more ketchup.