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 - 20 calories, 0 g fat (0% calories from fat), 2 g protein, 2 g carbohydrate, 1 g fiber, 0 mg cholesterol, 357 mg sodium