Barbecue Sauce - cooking recipe

Ingredients

1/2 c. vinegar
1/2 c. water
1/2 tsp. salt
1 thick lemon slice
1/4 c. margarine
1/2 tsp. black pepper
2 Tbsp. sugar
1 Tbsp. prepared mustard
1 small onion, chopped
1/4 tsp. cayenne pepper
1 1/2 tsp. liquid smoke
2 Tbsp. Worcestershire sauce
1/2 c. catsup

Preparation

Cook all but liquid smoke, Worcestershire sauce and catsup for 20 minutes, uncovered.
Add remaining ingredients.