Make the Miso-Wasabi Dressing: In a small bowl, whisk together the vinegar, miso, and wasabi powder. While whisking, slowly drizzle in the oil until it’s all incorporated.
Make the salad: Divide the lettuce among 4 bowls or plates. Top with the avocado, carrots, edamame, Sauerkraut, and tuna. Sprinkle with the sesame seeds and serve drizzled with the dressing.