Sloppy Joes - cooking recipe

Ingredients

1 medium onion
1/2 green pepper
1/2 c. celery
1 1/2 lb. hamburger
salt and pepper to taste
1 can tomato sauce
1 Tbsp. vinegar
1 Tbsp. sugar
1 Tbsp. Worcestershire sauce
chili powder to taste

Preparation

Cut up fine the onion, pepper and celery.
Simmer in butter; brown slightly.
Fry hamburger with salt and pepper.
Combine remaining ingredients.
Cook together for a few hours.
Serve on hamburger rolls.