Cook udon noodles as per the packet instructions. Drain and set aside.
Heat the oil in a large wok over high heat. Add the onion and stir-fry for 2 minutes, until it starts to soften. Add garlic and ginger. Stir-fry for a few seconds until fragrant.
Add minced pork, break it up and spread it in the wok. Let it cook for 2 minutes until it starts to brown, then break it up some more and stir. Cook for another 2 minutes until pork is caramelised and dry.
Add the cabbage and Asian greens. Toss and mix, and cook for 1-2 minutes until veggies are glazed. Add cooked udon noodles, chilli bean sauce, soy sauce, hoisin sauce, kecap manis, Shaoxing wine and Chinese 5-spice powder. Toss and mix well until evenly coated. Add MSG if using.
Stir-fry for 2 minutes until heated through. Remove from heat and serve hot.