INGREDIENTS
1/2 tsp
ground pepper
1/2 tsp
kosher salt
1 cup
beef broth
1 small
green bell pepper
1 tbsp
cornstarch
1 small
yellow onion
1 tbsp
worcestershire sauce
1 lb
lean ground beef
2 tbsps
ketchup
2 tbsps
butter
6
brioche buns
8 oz
provolone cheese
8 oz
brown mushrooms