This is great for when you want to eat a lot of vegetables. It especially uses winter vegetables. Komatsuna (Japanese mustard spinach) is also great as it warms up your body. You could also add mochi.
I've been using this recipe for more than 15 years. It's a low calorie soup with tons of vegetables. I made this to "reset" my body after New Year's eating.
The key is to season the dashi soup generously. Water will come out from the vegetables so adjust the seasoning as you go.
Enjoy Japanese food around the world.