Cook the soba noodles in boiling water according to package directions, adding the baby bok choy for the final 60 seconds of cooking.
Drain the noodles and bok choy together and rinse immediately under cold water to maintain the texture.
In a small mixing bowl, whisk together the tamari, rice vinegar, chili oil, and ground Sichuan peppercorns to create the sauce base.
Heat the toasted sesame oil in a large wok or skillet over medium-high heat until shimmering.
Add the ground pork, ginger, garlic, sea salt, and black pepper to the wok, breaking the meat into small crumbles until browned and crispy.
Add the cooked noodles and bok choy to the wok with the pork, tossing well to combine.
Pour the prepared sauce over the mixture and stir-fry for 1 to 2 minutes until the noodles are evenly coated and heated through.
Transfer to a bowl and garnish with freshly sliced green onions before serving.