Hamburger Barbecue Filling - cooking recipe

Ingredients

12 hamburger rolls
1 lb. hamburger
1/2 c. ketchup
2 Tbsp. vinegar
2 Tbsp. granulated sugar
1 Tbsp. mustard
1 Tbsp. Worcestershire sauce
1/2 c. chopped onions
salt and pepper to taste

Preparation

Get out Mother's heaviest frying pan and put all ingredients, except rolls, in it.
Cook over medium heat for about 20 minutes, stirring frequently.
Fill the rolls with mixture.
Serve hot.