Divide beef in half (if using) and form into flat patties. Season generously according to personal tastes. Place each patty in the center of a large square of heavy duty aluminum foil. Place a layer of potatoes on top of the meat followed by the carrots, mushrooms, onions and finish with the drained stewed tomatoes. Fold the foil around t he contents to form a tight packet. Cook on a hot grill, turning occasionally for half an hour to forty-five minutes.