Prepare the Wings: Wash the chicken wings thoroughly and drain them dry. Remove any remaining feathers.
Make the Marinade: Mix black pepper, white pepper, garlic powder, sugar, soy sauce, Shaoxing wine, and sesame oil in a bowl.
Marinate Wings: Add the chicken wings to the marinade and mix well. Add one egg, corn starch, and all-purpose flour to coat the wings evenly. Toss well and let marinate for 2 hours at room temperature.
Heat Oil: Heat about 7 cups of vegetable oil in a wok or deep frying pan to 325°F (163°C).
First Fry: Fry the wings in batches, avoiding overcrowding, for about 8 minutes until they start to take on some color. Shake occasionally to prevent sticking.
Drain Wings: Remove wings from oil and place on a wire rack over a cookie sheet to drain excess oil. Avoid paper towels to keep wings crispy.
Increase Oil Temperature: Raise oil temperature to 350°F (177°C) for the second fry.
Second Fry: Return wings to hot oil for 3-4 minutes to achieve a golden, crispy exterior. Wings are fully cooked at this point.
Final Drain and Serve: Remove wings and place back on the wire rack to drain. Optionally sprinkle with salt. Allow to cool slightly before serving.