INGREDIENTS
1 tbsp
butter
1/4 cup
chopped onion (optional)
1 lb
lean ground beef
1 cup
ketchup
1/2
to 1 cup water
1/4 cup
packed brown sugar
2 tbsp
Worcestershire sauce
1 tbsp
red wine vinegar
2 tsp
chili powder
1 tsp
salt
1/2 tsp
ground black pepper
6
hamburger buns
Butter, for buttering the buns (optional)