Texas Barbeque Sauce

Combine and simmer for 20 minutes:
1 1/2 c. butter
3/4 c. sugar
2 cloves garlic, crushed
1 tsp. paprika
1/2 c. tarragon vinegar
3 c. ketchup
2 tbsp. Worcestershire sauce
1 1/2 tsp. mustard
1/2 tsp. pepper
2 tsp. chili powder