Combine ginger, garlic, soy sauce, chiso and lime juice in flat glass dish just large enough to hold steak and set aside. Trim steak to remove excess fat and season to taste with pepper on top and bottom. Sear beef quickly in hot peanut oil on all sides over high heat. Cook to rare stage only. Place in dish with marinade and turn to coat well. Refrigerate, turning occasionally, at least one hour. Steak should be very cold and firm before slicing. To serve thinly slice diagonally. Sprinkle steak sauce with thinly sliced green onions cut on the bias and spoon small amount of marinade over or sliced vegetables, if desired.