BBQ Sauce for Ribs or Steak

BBQ SAUCE FOR RIBS OR STEAK
1 (15 oz.) can tomato sauce 1/2 c. chopped onion 1/2 c. brown sugar 1/2 c. ketchup 1 tbsp. vinegar 2 tbsp. Worcestershire sauce 2 tbsp. butter Simmer all ingredients until butter melts. Can be refrigerated for future use.