1. Wash and cut the vegetables into small pieces: carrots, parsnips, leeks, celery stalks, and mushrooms.
2. Heat 700 ml of water with the lemon leaves in a saucepan. Dissolve the miso paste in the water as soon as it starts to simmer. Add all the vegetables and cook for 8 minutes over medium heat, covered. Add the sesame oil to the soup off the heat.
3. Cut the scallions and cilantro. Make small cubes of silken tofu. Fill 4 bowls with the soup, vegetables, and miso. Sprinkle with scallions, cilantro, and tofu cubes. Add the soybean sprouts and serve.