INGREDIENTS
1 1/2
lbs Beef flank steak
1 lb
Onions
2 tbsp
Balsamic vinegar
1 tbsp
Soy sauce
2 tbsp
Worcestershire sauce
1
Black pepper, Ground
1 1/2 tsp
Brown sugar, packed
3 tbsp
Olive oil
6
Hoagie rolls or other soft sandwich rolls, soft
1/2 cup
American cheese
1/2 cup
Fontina cheese
1/2 cup
Muenster cheese