From Pang Hunan Cookbook
Heat a good glug of oil in a wok, until it's nearly smoking.
Coat the chicken slices with the cornflour and then the beaten egg.
Deep-fry the chicken slices in the hot oil for a minute or so. When they begin to turn golden, remove from the oil and set aside. Discard the oil.
Mix all the ingredients for the sauce in a bowl and adjust for seasoning.
When you are happy with the flavour, pour the sauce into the wok and heat through.
Return the chicken to the wok to warm through.
Season with salt and sugar to taste before serving.
