makes 1 cup dressing, enough for 2 large salads (which keep well, refrigerated, for a couple days)
Combine dressing ingredients in a jar and shake (or whisk in a small bowl). If nut butter is too firm, gently warm it using a microwave so that it combines more easily with the other ingredients.
Boil a pot of water. Add the soba noodles and cook al dente, about 4 minutes. Immediately transfer to an ice bath. (Cross check cooking time w/package instructions.)
Shred the vegetables using a microplane or knife and transfer to bowl big enough to toss with dressing. Drizzle in about half of the dressing and toss to combine. Keep remaining dressing refrigerated and use for another salad in a few days or next week.