Place the hiziki in a small saucepan with cold water just to cover. Cover the pan and bring to a boil. Reduce the flame and simmer for 10 minutes. Pour into a strainer and rinse under cold water. Drain and place in a salad bowl with the blanched vegetables. Toss to mix.
To prepare the dressing, place all ingredients in a blender and puree until smooth and creamy. Place the dressing in a serving dish. Spoon over the salad when served.
Per serving - 85 calories, 3 g fat (34% calories from fat), 9 g protein, 6 g carbohydrate, 3 g fiber, 0 mg cholesterol, 260 mg sodium