Velveted Fish - cooking recipe

Ingredients

14 ounces halibut fillets (or any white fish)
3 dried shiitake mushrooms, soaked in hot water from the kettle for 30 minutes and drained
1/2 red bell pepper
1/2 green bell pepper
3 scallions, green parts only
3 garlic cloves, thinly sliced
1 1/2 inches piece fresh ginger, peeled and thinly sliced
1/2 teaspoon light soy sauce
1/2 teaspoon rice vinegar
3 tablespoons chicken stock or 3 tablespoons water
1 teaspoon sesame oil
peanut oil, for cooking
salt, to taste
Marinade
1 tablespoon shaoxing wine or 1 tablespoon sherry wine
2 tablespoons egg whites
2 tablespoons cornstarch or 2 tablespoons potato flour
1/2 teaspoon salt
Cornstarch Paste
1/2 teaspoon cornstarch or 1/2 teaspoon potato flour
2 teaspoons cold water

Preparation

Mix together marinade, and mix together cornstarch paste.
Cut the fish into 1/2-inch slices and put in a bowl with marinade; mix well and set aside.
Drain and squeeze the mushrooms; remove the stems and slice the caps.
Cut the red and green peppers into 3/4-inch strips, and then diagonally into lozenge shapes.
Cut the scallion greens into bite-sized pieces.
Heat the wok over high heat, then add some peanut oil. When hot, add the fish and stir with chopsticks to separate the slices; when they are white but not fully cooked, remove with a slotted spoon and set aside.
Drain off all but three tablespoons of the oil, and return the wok to the stove top over high heat; add the garlic, ginger, mushrooms and peppers and stir-fry until fragrant; add the fish and season with soy sauce, vinegar and salt to taste; add the stock, and then the cornstarch paste, stirring as it thickens the liquid to a glaze.
Stir in the scallion greens and then, off the heat, the sesame oil. Serve.