Chop Mitsuba leaves.
Make Dashi broth with a Dashi packet. Or you can use a Dashi packet according to our Dashi recipe. Dissolve Miso paste. Keep warm.
Meanwhile, boil water in a different pot, and cook dried Somen for a couple of minutes. Drain water.
Add Somen to the soup, and immediately remove from heat. Top with Mitsuba leaves just before serving.