INGREDIENTS
1 lb
ground beef
1 tsp
sea salt
1/2 tsp
ground pepper
2 tbsps
butter
1 medium
yellow onion
1 large
green bell pepper
1/4 tsp
garlic powder
1 tbsp
worcestershire sauce
1/2 cup
beef stock
1 tbsp
cornstarch
4 slices
provolone cheese
4 larges
sub rolls