
Peel the daikon and cut it into small, even cubes so it cooks quickly and evenly.


Drain the firm tofu, pat it dry if needed, and cut it into bite-size cubes.


Peel the onion, then slice it thinly from root to tip.

Warm the cooking oil in a frying pan over medium heat. Add the sliced onion and cook, stirring occasionally, until softened and lightly golden, about 5 minutes.


Pour the water into a large pot and bring it to a gentle boil. Add the daikon, tofu, browned onion, and mirin, then reduce the heat and simmer until the daikon is tender, about 10 to 12 minutes.

Turn off the heat. Ladle a little hot broth into a small bowl, whisk in the dashi miso paste until smooth, then stir the mixture back into the pot. Cover for 2 to 3 minutes to let the flavors settle.


Serve the soup hot in bowls. For a heartier meal, spoon it over cooked rice and enjoy immediately.





