Leftover pot roast can be done into vegetable soup. Put it on the bottom for Shepard's Pie instead of ground beef. Put it into a casserole dish and put a biscuit top for beef pot pie. Break up the beef in a saucepan, add green onion pieces, celery sliced thin and beef boullion and bring to a boil, put in 3 teaspoons of curry powder and a cup of Basmati rice and reduce to a simmer with the lid on for 20 minutes for Beef Curry Rice.