Barbecue Sauce - cooking recipe

Ingredients

1/3 c. butter
onions
1/3 c. vinegar
1 c. ketchup
1/2 c. water
2 tsp. mustard
2 Tbsp. Worcestershire sauce
2 Tbsp. brown sugar
dash of salt

Preparation

Melt butter.
Cook onions until tender.
Add remaining ingredients.
Cover and cook over low flame for 10 minutes.