Barbecue

Ingredients

• 2 lb. hamburger
• 1 1/2 c. chopped onion
• 2 tsp. dry mustard
• 1/4 c. sugar
• 1/2 tsp. pepper
• salt to taste
• 2 tsp. celery salt
• 2 tsp. paprika
• 1/4 c. vinegar
• 1/2 c. water
• 1 c. catsup
• 2 Tbsp. butter
• 2 tsp. Worcestershire sauce