Barbecue Sauce - cooking recipe

Ingredients

1 large onion, chopped
1/2 c. tomato catsup
2 c. canned tomatoes
1 Tbsp. butter
1 clove garlic, chopped
1/2 c. Worcestershire sauce
1 Tbsp. sugar
1/2 c. vinegar
salt
red pepper
black pepper
mustard

Preparation

Strain tomatoes.
Add an equal quantity of water.
Add onion, garlic, catsup, butter, sugar, vinegar and Worcestershire sauce. Cover; simmer 10 minutes.
Season to taste.
Simmer 20 or 30 minutes more.
Thicken with flour, if desired, and cook until blended.