Cut the chicken breast into strips 5-7mm (¼") thick and then into bite-sized lengths.
Zest the lemon and mix it through the chicken along with the black pepper.
Grate the ginger.
Mash the garlic into a paste.
Squeeze the lemon juice into a small (15-16cm or 6") saucepan and add the garlic and ginger.
Add the chicken stock, honey, Shaoxing wine, and soy sauce to the pan and mix.
Turn the heat under the pan to a medium-high heat and bring it to a gentle simmer, and cook for 3-4 minutes.
Fill a wok with cooking oil to a depth of 4-5cm (1-1½") and heat it to 170°C or 340°F.
Add the flour, cornflour, salt and baking powder for the batter to a medium bowl and mix well.
Slowly pour in the cold sparkling water whilst mixing, do not worry if there are a few lumps, do not mix too much!
Dip the chicken into the batter, then fry for 4-6 minutes. Do this in batches of 7-8 pieces of chicken at a time.When each batch of chicken has been fried, place it on some kitchen paper to drain away excess fat.
Just before serving, mix the cornflour and water for the lemon sauce and whisk it into the sauce and cook until slightly thickened.