Cut tofu and avocado into cubes. The tofu is very delicate, so be careful. Place in a medium sized mixing bowl and set aside.
Whisk together the next five ingredients. Pour approximately 2/3's of the mixture over the avocado and tofu. Very carefully toss to coat. Put bowl in refrigerator and let marinate for 1 hour. While this sits, you can prepare your rice or other side dishes.
Once chilled, remove bowl from refrigerator and drizzle with the remaining marinade. Carefully toss one more time. Serve over rice and sprinkle with additional sesame seeds. Makes 3-4 small servings. Enjoy!