1. In a large pot, combine rice and water. Bring to a simmer. Cover and cook on low for about 45 minutes. Meanwhile, in a small saucepan, bring 1/4 cup vinegar to boil with sugar and salt, stirring until sugar is dissolved and remove from heat.
2. Transfer rice to a large bowl and stir in vinegar mixture. Cool rice and stir in sesame seeds, remaining 3 tablespoons vinegar, oil, ginger, green onions, carrot, cucumber, edamame, and nori strips. Top salad with avocado slices.
3. In a small bowl, stir wasabi powder into hot water and stir in cold water, soy sauce, and ginger juice. Drizzle dressing over salad and serve.
Note-look for the ingredients in the Asian section of the grocery store. If you can't find them at your regular store, try an Asian market.