Meat Pie, Potato Crust

Cut cold roast beef in thin slices, removing all fat and gristle. Cover the bones and trimmings with cold water, add a few slices of onions and carrots and a stalk of celery. Let simmer two hours. Strain off the broth and add slices of beef, simmering until tender. Season with salt and pepper and sprinkle over with flower. Cover over with a round of potato crust, leaving an opening in the top. Bake fifteen minutes.