Marinate the fish with water, young ginger juice, salt, white pepper, and cornflour.
Heat oil in a clay pot or pan, add ginger and shallots, and fry until fragrant.
Add shiitake mushrooms and garlic, and stir-fry briefly.
Pour in water, oyster sauce, light soy sauce, and dark soy sauce, and bring to a boil.
Gently add the marinated fish and celery, cover and cook for 3 minutes.
Pour in the Chinese cooking wine around the lid and cook for another 1 minute.
Turn off the heat and serve.
