Scale and clean the fish tail and cut off part of tail fin. Then cut it into 5 pieces about 1 inch wide lengthwise and marinate for 5 minutes with 4 tablespoons of soy sauce and ¼ teaspoon of black pepper.
Mix 2 teaspoons of cornstarch and 2 tablespoons of water in a dish for use later.
Heat 5 tablespoons of oil in frying pan. Fry the scallion and gin