In a small bowl mix together the lemon juice, water, light soy, sugar, white pepper and cornflour until smooth and no lumps remain. Add in half of the lemon zest too, and stir through. Reserving the rest as garnish.

Once your chicken or meat-free alternative is cooked set it aside. Heat the lemon sauce on a small saucepan or in a wok until simmering and once it's thickened up remove from the heat. Add the cooked meat to a wok then pour over the lemon sauce and toss it so it completely coats the chicken pieces.