Cut the lemon skin off slice into thin slices and place it into a bowl
Now Prepare lemon sauce: in a mixing bowl, add thinly sliced lemon skin, sugar, white vinegar, honey, lemon, and custard powder. Stir to mix evenly.
Cut the chicken breast into thin slices and use the back of the knife pounding on each piece to tenderize the meat.
In a mixing bowl, marinate chicken breasts with salt, wine, black pepper powder, corn flour, custard powder, and egg. I like to leave it sitting in this for around 15-20mins.
Now for the coating: Put flour in a tray so that each piece of chicken can be evenly coated with the flour.
Add the coated chicken to a plate for when you are ready to do the frying
In a heated wok, deep-fry the chicken at an oil temperature of 300-350°F (150-180°C) until slightly golden. The key here is the wok or pan has to be at this high temperature before you start frying the chicken.
Remove the fried chicken from the oil. Wait a couple of minutes (this is to let the oil temperature go up a little.) and re-fry quickly until golden. Remove and drain with a strainer.