Ingredients:
2 lb (900 g) thinly sliced roast beef, cooked1½ cups (360 ml) beef broth1 packet (1 oz / 28 g) brown gravy mix1 packet (1 oz / 28 g) au jus gravy mix1 tablespoon Worcestershire sauce1 tablespoon soy sauce1 small onion, finely chopped (optional)½ teaspoon black pepper½ teaspoon garlic powder6–8 sandwich rolls or hoagie buns6–8 slices provolone or Swiss cheese (optional)2 tablespoons butter, for toasting the rolls
Instructions:
1. Prepare the gravy: In a bowl, whisk together the beef broth, brown gravy mix, au jus mix, Worcestershire sauce, soy sauce, black pepper, and garlic powder until smooth.2. Add the beef: Place the sliced roast beef in the slow cooker. Add the chopped onion, if using.3. Pour in the sauce: Pour the gravy mixture over the beef and stir gently to coat all the slices.4. Slow cook: Cover and cook on LOW for 3–4 hours or until the beef is hot and tender. If using freshly cooked raw beef instead of prepared roast beef, the cooking time and method will need to be adjusted.
5. Toast the rolls: Spread butter on the cut sides of the rolls and toast them in a skillet or oven until lightly golden.6. Assemble the sandwiches: Fill each roll with hot beef and spoon some rich gravy over the meat. Add provolone or Swiss cheese if desired.7. Serve: Serve immediately with extra gravy on the side for dipping.