Bring a large pot of water to a boil and cook the soba noodles according to package directions, then drain and set aside.
In the last 2 minutes of the noodle cooking time, add the baby bok choy to the pot to blanch until tender-crisp, then drain.
In a small dry skillet, toast the Sichuan peppercorns over medium heat until fragrant, then crush them into a fine powder using a mortar and pestle.
In a small bowl, whisk together the tahini, chili oil, tamari, rice vinegar, and crushed Sichuan peppercorns to create the sauce.
Heat the sesame oil in a large skillet over medium-high heat. Add the ground turkey, minced garlic, and grated ginger, seasoning with sea salt and black pepper.
Sauté the turkey, breaking it up with a spatula, until it is browned and cooked through.
Divide the noodles and bok choy into a bowl, pour the sauce over the noodles, and top with the sautéed turkey and sliced green onions.