Remove any fat and cut the meat into pieces. Cut the onions and carrots into thin slices and the potatoes into thicker slices. Arrange the meat, onion, carrots and potatoes in layers in a casserole and season well. The top layer should be of potatoes neatly arranged. Three-quarters fill the casserole with cold water or stock, adding more later if the dish appears to be dry. Cover and bake in a warm oven (335° F., Gas 3) for 2 hr. Uncover ½ hr. before serving to allow the top layer of potatoes to brown. Serve in the casserole.