Barbecue Sauce

Ingredients

• 1 c. ketchup
• 1/2 c. cider vinegar
• 1 tsp. chili powder
• 1/2 tsp. salt
• 1 1/2 c. water
• 3 celery stalks, chopped
• 3 bay leaves
• 1 garlic clove
• 2 Tbsp. chopped onion (fine)
• 4 Tbsp. butter
• 4 Tbsp. Worcestershire sauce
• 1 tsp. paprika
• dash of black pepper