Step 1

Soak sour mustard for 30 minutes. Rinse, drain and cut into thin strips.

Step 2

Combine all sauce paste ingredients in a small bowl. Mix well.

Step 3

Place fish on a large plate. Sprinkle salt and ground pepper all over the fish.

Step 4

Heat 4 tablespoons vegetable oil in a wok or large fry pan. Add prepared fish and fry until cooked and lightly brown, about 8 minutes (4 minutes on each side). Transfer fish to a serving dish.

Step 5

Heat remaining 2 tablespoons vegetable oil in the wok or large fry pan. Add sauce paste and stir fry for 2 minutes.

Step 6

Add prepared pickled mustard green. Stir fry for 30 seconds.

Step 7

Pour in water. Stir to mix. Cover and bring to a boil. Allow it to simmer for 2 minutes.

Step 8

Add cornstarch slurry. Stir to mix. Sauce will start to thicken. Turn off stove.

Step 9

Ladle sauce over the fried fish. Garnish with green/spring onions and serve immediately.