Heat the oil in a large saucepan. Add the mushrooms and garlic and cook over moderate heat, stirring, until fragrant, about 1 minute. Cover and cook over low heat, stirring a few times, until the mushrooms are tender, about 6 minutes. Add the tomato paste and cook, stirring, for 1 minute. Pour in the water, stir well and bring to a boil. Add the tomatoes, cover and simmer over low heat for 5 minutes. Whisk in the miso and soy sauce and return to a simmer. Add the tofu and simmer for 2 minutes. Ladle into bowls, garnish with the scallions and radishes and serve.
Notes: One Serving - Calories 203 kcal, Total Fat 7.1 gm, Saturated Fat 0.6 gm, Protein 8.2 gm, Carbohydrates 28 gm