Place hiziki in a small saucepan with cold water to cover. Cover pan and bring to a boil. Reduce heat and simmer 10 minutes. Pour into a strainer and rinse under cold water. Drain and place in a salad bowl with blanched vegetables. Toss to mix.
To prepare the dressing, place 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 - 77 calories, 4 g fat (39% calories from fat), 7 g protein, 6 g carbohydrate, 2 g fiber, 0 mg cholesterol, 100 mg sodium