Cut the pork to bite sized pieces, mince the garlic and green onions, and cut the chives to 2 inch lengths. Zha Cai (Pickled Mustard Plant) are to be julienned (slightly wide strips).
Heat sesame oil in a frying pan and add in the bean sprouts. Season the bean sprouts with salt and pepper. Place the cooked bean sprouts (Bean sprouts should be crisp, so do not overcook!) on a serving plate.
In a separate frying pan, heat vegetable oil and sesame oil. Add the garlic and cook over low heat, until fragrant. Add in minced green onions and stir-fry. Add the yakisoba noodles and continue to stir-fry.
As the noodles loosen, add in the Zha Cai and chives. Pour sake and oyster sauce over the noodles and stir thoroughly. Swirl in la-yu (chili oil) and season the noodles with salt and pepper if necessary.
Place the yakisoba noodles over the bean sprouts from Step 2. Garnish with chili threads to finish. Enjoy!