Ingredients
1 pounds lean ground beef
2 tablespoons butter
1 small yellow onion, diced
1 small green bell pepper, diced
8 ounces brown mushrooms, chopped
2 tablespoons tomato sauce
1 tablespoon Worcestershire sauce
1/2 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
1 tablespoon cornstarch
1 cup beef broth
8 ounces chopped provolone cheese slices (use 6 ounces if you don’t want it too cheesy)
6 loaves of brioche burgers
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