Mix all the ingredients of the marinade together and marinate the fish for at least one hour.
Bring a pan of water to the boil, add the noodles to cook for approx 5 minutes. Drain and rinse under cold running water to prevent them sticking.
Heat the wok with the tea oil. Add the shallots, mushrooms and fish (reserving the marinade). Stir-fry for 2-3 minutes. Add the remaining vegetables and stir-fry for another 3 minutes, adding the marinade at the end. Stir through for a further 1 minute.
Serve over the green tea noodles.
Note: Green tea noodles are available from Asian grocers.