Combine water, kombu, dried mushrooms, and bonito flakes in a medium-sized soup pot. Bring to a boil. Immediately remove from heat.
4 shiitake mushrooms, 1 piece kombu, ⅓ cup bonito flakes, 4 cups water
Position a mesh strainer (or equivalent) over a medium-sized soup bowl and pour the soup through. Discard the solids and rinse the soup pot to remove residual bonito flakes. Return the stock to the soup pot over medium low heat.
Whisk and/or stir in miso paste until no lumps remain. Do not boil the soup once miso is added.
4 tbsp miso paste
Add mushrooms, green onions, tofu, and wakame. Allow to sit until the ingredients are warmed through. Enjoy immediately!
¼ container tofu, 2 green onions, 4 brown mushrooms, ¼ cup wakame