1/2 c. light or dark Karo
1/2 c. ketchup
1/2 c. finely chopped onion
1/4 c. cider vinegar
1/4 c. prepared mustard
1/4 c. Worcestershire sauce

In saucepan, stir together all ingredients. Bring to boil; reduce heat and gently cook 1/2 hour. Makes 2 cups.