Prepare the sauce:

1. In a small bowl, combine the first 3 sauce ingredients and set aside.
2. In a second bowl, combine the cornstarch and water and set aside.
3. Heat the wok.
4. Add 2 tbsps oil to the heated wok.
5. Add the fish fillets and sear until lightly browned.
6. Remove the fish from the wok.
7. Add 2 tbsps oil to the wok.
8. Add the garlic, ginger, and onion and cook until the onion is lightly browned.
9. Add the remaining vegetables and stir-fry.
10. Add the sauce, heat to bubbling, and add the cornstarch and water, stirring quickly to thicken.
11. Add the fish back into the wok. Mix everything through.
12. Sprinkle the cooked fish and vegetables with the ground coriander before serving.

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