Barbecue Sauce - cooking recipe

Ingredients

1 medium onion
1 bottle catsup
1 bottle water
1 tsp. salt
2 tsp. dry mustard
1 tsp. celery salt
1 Tbsp. Worcestershire sauce
1/4 c. vinegar
1/2 c. brown sugar

Preparation

Brown chopped onion in a small amount of butter.
Add other ingredients.
Simmer 30 minutes.