Combine the chicken with half of the salt, sherry, soy sauce, cornflour, 1 tbsp chicken stock, egg yolk, and pepper to marinate for 10 minutes
Coat the chicken in plain flour
Heat the oil in a wok until a cube of bread browns in 30 seconds
Deep fry the chicken for about 1 minute until it turns golden brown
Remove the chicken from the oil and drain it
Pour off the excess oil from the wok, leaving about a tablespoon
Add the sugar, lemon juice, sesame oil, remaining salt, and the cornflour blended with chicken stock to the wok
Stir the mixture until it thickens
Pour the sauce over the chicken and garnish it with slices of lemon and/or strips of lemon rind