Chunky Barbecue Sauce

Ingredients

• 2 Tbsp. butter
• 1 medium onion, chopped
• 1 clove garlic, chopped
• 1/2 c. celery
• 1/4 c. green pepper, chopped
• 1 (16 oz.) can tomatoes
• 1 (6 oz.) can tomato paste
• 1 bay leaf
• 2 tsp. dry mustard
• 1 1/2 tsp. salt
• 1/2 tsp. ground cloves
• 1/2 tsp. ground allspice
• 1/3 c. vinegar
• 3 tsp. dark molasses
• 2 tsp. Tabasco
• 2 slices lemon