To tie onto Reverend Al's roast beef post, I thought I'd share a new one I just tried that the missus and I liked.
Put a can of French onion soup in a pot (or mix up a package) and warm up. Put 1lb give or take, thin sliced roast beef in the soup to warm. While that's warming up, roll out a can of biscuits flat (8 individual biscuits). With a slotted spoon, scoop out some roast beef without any of the soup and place in center of a biscuit, top with Italian cheese, and pinch it together over top of the beef making a dumpling of sorts. Repeat till you have all 8 done and are out of beef. Bake in the oven to cook the biscuits, serve with the reserved soup as a French dip. Really good for leftovers!