Warm all the sauce ingredients over medium-high heat for 1–2 minutes, just until they meld together. For a richer, thicker sauce, let it reduce a little longer; for a lighter consistency, take it off sooner. Remove from the heat and stir in the freshly ground pepper.
Combine the pork with the marinade and let it sit for at least 10 minutes.
Heat a wok over medium-high. Stir-fry the Yacai for about 30 seconds, then add the marinated pork. Season with the soy sauce and Shaoxing wine.
Once the pork is browned and fragrant, transfer the mixture to a bowl.
Cook the noodles according to the package directions, then rinse under cold water to stop the cooking.
Spoon a few tablespoons of the warm sauce into the bottom of each serving bowl.
Pile the noodles over the sauce, add a generous spoonful of the pork topping, then drizzle with extra chili oil and scatter with green onions.