1 1/2 lbs. ground beef
1 c. chopped onion
1 (15 oz.) can tomato sauce
1 (16 oz.) can tomato paste
3 tbsp. vinegar
2 tbsp. brown sugar
2 tbsp. Worcestershire sauce
1/4 tsp. salt
1/8 tsp. pepper
12 hamburger buns

Crumble beef into 2 quart microwave casserole. Add onion. Microwave on high 8 minutes or until meat is no longer pink. Stir every 3 minutes. Drain fat.

Stir in tomato sauce, paste, vinegar, brown sugar, Worcestershire, salt and pepper. Cover and microwave on high 10 minutes - stir every 3 minutes. Let stand covered 10 minutes.