Kitsune Udon is a Japanese noodle soup in dashi broth, topped with seasoned fried tofu, pink-swirl narutomaki fish cake, and scallions. This hearty udon soup is one of the most popular, classic Japanese noodle dishes. The best recipe we have found for it is at the link above.
You will also need the kitsune, which is fried tofu pocket. You can get these at your local Japanese market.
And instead of using the packet of soup flavoring in the udon noodes, I used to make homemade dashi, but this condensed version of dashi is quicker and just as good.