Mix together all the sauce ingredients and set aside.
Heat the oil in a wok or large nonstick frying pan until hot. Add the meat and stir fry until just done, then remove from the pan with a slotted spoon and set aside.
Turn the heat down to medium, add the onion, carrot, green pepper and cabbage to the pan and stir fry for 10 minutes. Return the meat to the pan with the noodles and the sauce. Toss everything together and cook for another few minutes, stirring well.
Divide between 4 plates and serve with the pickled ginger, if using.
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