Ingredients
- 2 tablespoons unsalted butter
- 1 small white onion , chopped
- 1 green bell pepper , seeded and chopped
- 1 pound lean beef , 90/10 blend
- 1/2 cup beef stock
- 1/4 cup ketchup
- 2 tablespoons Worcestershire sauce
- 1/2 teaspoon garlic powder
- 1/2 teaspoon kosher salt
- 1/2 teaspoon freshly ground black pepper
- 12 slices provolone cheese , divided
- 6 bun brioche buns store-bought or homemade
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