We are going to use the leftover BBQ Chuck Roast from Meal 4. However, if by some chance you decided not to cook Meal 4, here is a fantastic easy recipe for BBQ Beef Sandwiches. Pull out the leftover BBQ Chuck Roast and heat it in a saucepan on low heat. Don’t let it dry out. Add a little water (2-3 Tablespoons, or so) if needed to keep it moist.