Miso Soup with Shiitake Mushrooms and Tofu

Soak the shiitake mushrooms in a pot with 1.2 liters of water for 2-3 hours. Afterwards, simmer the mushrooms in the water, half-covered, for 10 minutes.

Wash the spinach and slice the spring onions into rings.

In a bowl, mix miso, mirin, and 4 tbsp of the mushroom broth.