Slice chicken breast into thick pieces and pound lightly with a meat mallet.
Smash ginger and mix with cooking wine. Massage the ginger wine and soy sauce into the chicken for about 1 minute.
Add egg and cornstarch. Mix until evenly coated.
Pan-fry chicken over medium heat until golden on both sides. Remove and set aside.
In the same pan, fry ginger and scallion whites for about 1 minute.
Lay the scallion greens underneath, then place the chicken on top.
Pour in the sauce and water. Bring to a boil.
Cover and simmer over medium-low heat for 10 minutes.
Remove the lid and reduce the sauce until glossy.
