Place the hiziki in a small saucepan, add cold water to just cover the hiziki. 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. Place the hiziki in a salad bowl with the salad greens, tomato, carrot and avocado. Toss to mix.
Prepare the dressing by placing all ingredients in a blender. Pulse several seconds to blend evenly. Place the dressing in a serving container. Pour over salad before serving.
Per serving - 254 calories, 22 g fat (75% calories from fat), 2 g protein, 13 g carbohydrate, 3 g fiber, 0 mg cholesterol, 398 mg sodium