Barbecue Sauce - cooking recipe

Ingredients

1/2 onion, chopped
2 Tbsp. butter
1 c. ketchup
1/2 c. water
1 Tbsp. vinegar (brown)
1 Tbsp. soy sauce or Worcestershire sauce
1/4 c. brown sugar
1 Tbsp. mustard

Preparation

Saute onion in butter.
Mix in all other ingredients.
Simmer on low heat for 15 minutes.
Do not boil.