In a small bowl whisk together the miso, garlic, and tahini, then add in the sesame oil, soy sauce, and rice vinegar.
Add the water a little at a time to thin out the dressing to a pourable consistency. You may or may not need all of it.
Toss the chilled soba noodles with the dressing. They are delicious as is however feel free to add shredded carrots, sesame seeds, scallions, fresh herbs, roasted salmon.