Marinate rock cod fillet pieces with light soy sauce, Shaoxing wine, cornstarch, and white pepper for 15 minutes.
Heat vegetable oil in a wok over medium-high heat. Briefly pan-fry the marinated fish pieces until lightly golden (do not cook through). Remove and set aside.
Add julienned ginger and a portion of the spring onion (cut into lengths) to the wok, stir-fry until fragrant.
Add sliced shiitake mushrooms and rehydrated tofu skin, stir-fry for 2 minutes.
Pour in the braising sauce mixture (oyster sauce, light soy sauce, dark soy sauce, sugar, Shaoxing wine, mushroom liquid + water, white pepper). Bring to a simmer.
Gently add the partially fried fish fillets back into the wok.
Cover and braise for 5-7 minutes, or until fish is cooked through and tofu skin is tender.
Stir in the cornstarch slurry to thicken the sauce to your desired consistency.
Garnish with the remaining spring onion (cut into lengths) before serving.
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