Make dashi in a pot. (Water + dashi stock powder is OK, too) When the dashi starts to boil, add the grated potato. Simmer while mixing well.
When it starts to thicken, add the miso. Add the diced tofu.
Serve in a bowl, sprinkle chopped green onions, and it's done. Serve piping hot.
Story Behind this Recipe
I rearranged a surinagashi soup (made with dashi and ground up ingredients) to a warm miso soup.
I use strong bonito flake dashi soup and thinly flavor it with miso. If it doesn't have a strong dashi flavour, it tastes like baby food. Step 1: Once you add the potato, simmer while stirring. If you leave it, it will get thick and chunky at the bottom of the pot.