Place water, shiitake and bonito flakes in a pot, cover and bring to a boil. Reduce the flame to medium-low and simmer 10 minutes. Add the carrots and bonito flakes, cover and simmer 3 minutes. Reduce the flame to very low. Purée the miso with 3 T. water or soup broth. Add wakame flakes, tofu and pureed miso to the pot. Simmer without boiling for 2 minutes. Serve garnished with scallions.
Per serving - 159 calories, 8 g fat (38% calories from fat), 19 g protein, 10 g carbohydrate, 4 g fiber, 0 mg cholesterol, 252 mg sodium