Saute 3/4 cup chopped onion in 1/2 cup vegetable oil.

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

Stir and simmer for 20 minutes.