Cook udon according to package directions, rinse, drain and set aside. Heat the oils in a large skillet and sauté the garlic, onions, mushrooms and 1/2 tablespoon of shoyu for 3 to 4 minutes. Place the udon on top of the mushrooms and onions. Turn the flame to medium-low. Sprinkle the remaining shoyu over the udon, add the scallions, cover and simmer for 5 to 7 minutes or until the udon is hot, mixing periodically. Place in a serving dish.
Per serving - 263 calories, 6 g fat (21% calories from fat), 10 g protein, 45 g carbohydrate, 5 g fiber, 0 mg cholesterol, 466 mg sodium