Chinese
Heat the oil in a wok over medium-high heat and stir-fry the pork for 5 minutes, breaking it up, until browned and dry.
Add the Shaoxing wine, 1 tbsp soy sauce and the ya cai and stir-fry for 3 more minutes until the pork is crisp; set aside.
Divide the sesame paste, remaining soy sauce, chili oil, vinegar, sugar, Sichuan pepper and garlic among 4 bowls and stir each into a sauce.
Boil the noodles in plenty of water for 4-5 minutes or as the package directs, adding the bok choy for the last minute.
Stir 3 tbsp of the noodle water into each bowl to loosen the sauce.
Drain the noodles and bok choy, divide them among the bowls and top with the pork.
Sprinkle with peanuts and scallions and toss everything together before eating.