pat dry the chicken wings. Poke some small holes in the chicken wings with a fork or toothpick. Mix well and set aside for 15 minutes.
During marinating, finely chop the egg yolk.
Prepare a plate, then spread cornstarch on it. Dip the chicken wings in cornstarch to ensure each side is well coated.
Add a little more oil to a pan, then shallow-fry the chicken wings until crispy. Let it stay for a while until the crust is formed and then flip over and fry the second side. Use medium fire and fry the chicken wings for around 8-10 minutes until they are cooked completely. Flip frequently at the last stage.
Scoop extra oil and leave only 2 tablespoons. Wipe alway any fall-offs with a kitchen paper.
Add the yolks to the pan. Using a spatula, constantly stir and press down on the yolks. So we can achieve a fine, sandy texture.
Continue stirring over low heat until the mixture begins to foam and develop large, airy bubbles. Now return the chicken wings, mix and the sandy egg yolk will adhere automatically.