INGREDIENTS
2 tbsp
vegetable oil
1/2
medium onion, chopped finely
1/2 tsp
salt
2 cloves
garlic, minced
2 tsp
chili powder
1 lb
ground sirloin
Freshly ground black pepper,
1 15 ounce can
tomato sauce
1/4 cup
water
1/4 cup
dark brown sugar
1
to 2 tablespoons red wine vinegar
1 tbsp
Worcestershire sauce
1 tbsp
yellow mustard
1
to 2 teaspoons crushed red pepper flakes
2 tbsp
tomato paste
4
hamburger buns
Butter, for spreading on hamburger buns