1/2 c. chopped onion
1 c. ketchup
1/3 c. vinegar
1 tsp. Worcestershire sauce
1 tbsp. oil
3/4 c. water
1/2 c. brown sugar
1/4 tsp. celery seed

Sauté onion in oil until tender. Blend in ketchup, water, vinegar, sugar, Worcestershire sauce and celery seed. Simmer 20 minutes or until sauce thickens.