Sloppy Joes - cooking recipe

Ingredients

1/2 c. onion, chopped
1 Tbsp. butter
1 lb. ground beef
2 tsp. vinegar
3 Tbsp. brown sugar
1 Tbsp. mustard
1 Tbsp. Worcestershire sauce
1 c. ketchup
1/4 c. water

Preparation

Brown beef and onion in butter.
Combine all other ingredients and simmer.
Serve over buns.