Sooter's Barbecue Sauce

Ingredients

• 1 onion, chopped
• 1/2 cup celery, chopped
• 2 tablespoons butter
• 2 tablespoons vinegar
• 1 1/4 cups brown sugar
• 1/4 teaspoon liquid smoke
• 2 cups ketchup
• 3 tablespoons Worcestershire sauce
• salt and pepper to taste
• 1/2 teaspoon mustard
• 1/2 teaspoon cinnamon