1 lb. ground beef
1 sm onion, chopped
1 (10 1/2 oz.) can tomato soup
1 tbsp. vinegar
1 tbsp. brown sugar
1 1/2 tsp. chili powder
1 tsp. Worcestershire sauce
1/4 tsp. celery salt
1/2 tsp. salt
Cheese slices (optional)
Hamburger buns

Brown meat with onion, drain fat. Add remaining ingredients. Put on buns, top with cheese.