Start by making the dressing. Add all of the dressing ingredients to a small bowl and whisk until combined.
Next make the sushi bowls. Place the cauliflower chunks into a food processor and blend until finely chopped and rice like, about 1 minute. Heat a large pan over medium heat and add olive oil. When the oil is hot, add the cauliflower. Cook until the cauliflower is softened, 5-7 minutes, flipping occasionally with a spatula.
To prepare the sushi bowls, divide the cauliflower rice equally into 4 bowls. Top each bowl with equal portions of tofu, beets, cucumber, avocado and nori. Top with desired amount of dressing. Serve.