Gather dashi stock, miso paste, tofu, wakame, and green onions
Heat the dashi stock gently until hot, but do not boil
Soak dried wakame in water until rehydrated, then drain
Cut tofu into small cubes
Place miso paste in a small bowl
Add a little hot dashi to the miso and dissolve it smoothly
Add the tofu and wakame to the pot
Turn off the heat or keep it very low
Stir in the dissolved miso
Add sliced green onions
Serve immediately