Bring a pot of water to a boil and cook the soba noodles for 4-5 minutes until tender, then drain and set aside.
In a large skillet over medium-high heat, add the ground pork and cook until browned, breaking it into small crumbles with a spatula.
Stir in the minced garlic and grated fresh ginger, cooking for 1 minute until fragrant.
Add the chopped bok choy to the skillet and sauté for 2 minutes until the leaves are wilted and stems are slightly tender.
In a small bowl, whisk together the tahini, tamari, chili oil, sea salt, black pepper, and water to create a smooth, creamy sauce.
Pour the sauce over the pork and vegetable mixture in the skillet, then add the cooked soba noodles.
Toss everything together over medium heat for 1 minute until the noodles are well-coated and the sauce is hot and glossy.