Bring water to a boil. Puree the miso with 2 teaspoons cold water. Reduce flame to low and add pureed miso. Tear nori into small pieces and add to the soup. Simmer 2 minutes. Add scallions and serve.
Per serving - 15 calories, 0 g fat (20% calories from fat), 1 g protein, 2 g carbohydrate, 1 g fiber, 0 mg cholesterol, 279 mg sodium