This easy beef hash includes diced potatoes and leftover cooked beef. Use leftover pot roast, an oven-roasted beef or corned beef. Or make the hash with leftover pork or lamb. Leftover beef and other meats make fabulous sandwiches, casseroles, and pies. This hash is an excellent baked alternative, and it's a snap to prepare and cook. If you have leftover gravy or a jar of gravy in the pantry, replace some or all of the beef stock with it. This beef hash is a tasty side dish to serve as a breakfast dish with poached, fried or scrambled eggs. If you are serving the hash as a lunch or dinner dish, add a tossed salad or steamed vegetables and serve the hash with freshly baked biscuits or slices of crusty bread. Green beans, peas, and steamed broccoli are good choices. The hash is great with baked beans, too.