A hearty sandwich ... the beef using your oven (the best way to reheat beef without losing tenderness), and you could serve it with any leftover gravy from the pot roast or a classic au jus ...
Place onions in 5.5-quart slow cooker; top with beef, then pepper slices. Combine beef broth, tomato paste, soy sauce and garlic; add to slow cooker. Cover and cook ... Serve au jus for dipping ...
But that doesn’t make it any less Philly ... Famous Fourth Street’s roast beef comes au jus, so you can dip the mile-high sandwich (on rye!) into the gravy before you unhook your jaw to ...