In a large pot, combine the boiled water, soy sauce, miso, rice vinegar and sesame oil. Whisk everything together until the miso is fully dissolved. Add the mushrooms, tofu, carrot, garlic and ginger.
Chef Avi Sternberg is continuing his ramen food culture training with chef Matsubara, owner of Ryukishin, a well-loved ramen shop in Namba City, a district of Osaka, Japan.