Nobu's Miso Soup
In a saucepan, heat dashi over low heat. Place miso in a fine strainer, and place in dashi. Using a whisk, gently push miso through strainer. Cook until heated through.
Place tofu slices in soup, and cook until they rise to the top, about 1 minute. Add scallions to soup bowls, and ladle soup over. Serve immediately.
SourceMartha Stewart Living, March 2000