- 
        
        Cut the chicken into long strips about 1 cm wide and then set aside.
 
        - 
        
        Combine the egg, water, soy sauce, sherry and cornflour in a small
        bowl and mix until smoogh.
 
        - 
        
        Pour the egg mixture over the chicken, mixing well and set aside for
        10 minutes.
 
        - 
        
        Sift the extra cornflour and plain flour together onto a plate. Roll
        each piece of chicken in the flour, coating each piece evenly, and shake
        off excess
 
        - 
        
        Place the chicken in a single layer on a plate ready to be fried.
 
        - 
        
        Heat the oil for deep-frying in a wok or pan. It is hot enough to
        use when a cube of bread turns brown in it in 30 seconds.
 
        - 
        
        Carefully lower about 4 pieces of chicken into the oil and cook
        until golden brown.
 
        - 
        
        Remove the chicken with a slotted spoon and drain it on paper
        towels.
 
        - 
        
        Repeat with the remaining chicken. Let the chicken stand while
        preparing the sauce.
 
        - 
        
        To make the lemon sauce : Combine the lemon juice, water, sugar,
        sesame seed and sherry in a small pan.
 
        - 
        
        Bring to the boil over medium heat, stirring until the sugar
        dissolves
 
        - 
        
        Stir the cornflour into the extra tablespoon water and mix to a
        smooth paste.
 
        - 
        
        Add it to the lemon juice mixture, stirring constantly until the
        sauce boils and thickens. Set the sauce aside.
 
        - 
        
        Just before serving, reheat the oil in a wok to very hot. Add all
        the chicken pieces and fry for 2 minutes until very crisp and a rich
        golden brown.
 
        - 
        
        Remove the chicken with a slotted spoon and drain well on paper
        towels.
 
        - 
        
        Pile the chicken onto a serving plate, drizzle over the sauce,
        sprinkle with spring onion and serve immediately.