How to Make It
Bring the chicken stock to a boil in a covered large pot over high heat.
In a small bowl, whisk the miso and 1 tablespoon of the soy sauce. (You do this so that the miso can easily integrate with the stock, otherwise you’ll get big clumps.) Add this to the pot with the remaining 3 tablespoons soy sauce, the scallions, and tofu.
Return to a boil and add the noodles. Cook until they’re just barely tender, 2 to 3 minutes, then stir in the chicken and cook until the noodles are al dente and the chicken is hot, 2 to 3 minutes more. Ladle the soup into bowls while it’s super hot and then drop an egg yolk into each bowl. Stir to mix the yolk into the soup, and then top with the kimchi and more scallion greens.
Excerpt from Healthyish by Lindsay Maitland Hunt.