Fu is a food made by kneading wheat flour and extracting only the gluten.
Since it absorbs a lot of broth, it is often used in soup or boiled dishes. In Japan, fu is used in many soup dishes as a side dish, and many people eat it without knowing that it is fu.
Wikipedia Fu (麩) https://ja.wikipedia.org/wiki/%E9%BA%A9
This is a miso soup of mushrooms, shimeji and enoki.
Shimeji mushrooms and enoki mushrooms are both mushrooms, but they have very different tastes and textures. The miso soup of the two kinds of mushrooms is also delicious.