Mix all the sauce ingredients in a medium bowl until smooth, then set aside.
Heat the oil in a wok over high heat. Fry the garlic, ginger and spring onion for 1 minute, tossing.
Add the pork, soy, Shaoxing wine and five-spice. Cook, stirring, until well browned.
Cook the noodles in a large pot of salted boiling water according to packet directions.
Add the greens in the last 2 minutes of cooking, then drain.
Divide the sauce between serving bowls.
Top with the noodles, pork mixture, then cooked greens.
Top with reserved spring onions, then toss together before eating.
