1Make the batter: In a bowl, mix together 4 tbs of cornflour, 1 tbs of plain flour, 1 egg yolk, 1 tbs of oil and a glass of water until you obtain a smooth and sticky consistency.
2Dice 300g of chicken thighs.
3Marinate the chicken: Add 1 tbs light soy, 1 tsp white pepper and 1 egg white to the chicken and mix well.
4Add the marinated chicken into the batter and mix to coat well.
5Make the sauce: In a bowl, mix together 1 tbs light soy, 1 tbs oyster sauce, 2 tbs sugar, 2 tbs vinegar, 3 tbs water and 1/2 tbs cornstarch.
6Heat the oil to 150°C and fry the chicken for 3-5 minutes until golden.
7Raise the oil temperature to 170°C and fry the chicken for another minute for a crispy coating.
8Toast the sesame seeds in a wok over low heat for about a minute until color changes.
9Heat some oil in a wok, add garlic and bird's eye chillis and stir-fry.
10Add the sauce and once it's heated through, add the fried chicken.
11Toss the chicken in the sauce, flip the pan three times.