Wash fish and remove scales. Wipe dry, and cut out fish head and tail. Cut body into smaller pieces.
mix fish with 2tsp cornstarch, and mix in rest of marinade. place in fridge for 30 minutes.
Rinse prawns in water and wipe dry then marinade for 10 minutes.
Heat oil in wok, when oil starts to steam , put in fish pieces and shallow fry for 3-4 minutes. Take out and drain oil. Place on serving plate.
Heat oil in wok, fry scallions, dried scallops, prawns, mushrooms and carrots and fry well.
Add in sauce ingredients and stir well, then pour onto fish pieces.