Mix all of the dressing ingredients together. Taste for seasoning and chill in the refrigerator.
For the Salad
Cook the udon noodles according to directions, al dente. Drain and let cool.
In a large bowl add the noodles, julienned vegetables, spinach and the salad dressing. Toss well.
Cover and put in the refrigerator for at least 2 hours to allow the flavors to meld.
Video
Notes
Here is a simple way to incorporate kale into the salad to replace th spinach.Destem the kale.Lightly steam the kale for 1 ½ to 2 minutes. Rinse to cool and stop the cooking process. It will be bright and green and wilted.In a large bowl add the noodles, vegetables, kale and the salad dressing.Toss and refrigerate.