Place the tuna in a bowl with the poke dressing ingredients. Stir to combine and set aside to marinate.
Meanwhile, place the kohlrabi noodles into a food processor and pulse until rice-like. Add to a medium bowl with the avocado and lime, and stir to combine. Season lightly with pepper.
Divide the rice into 4 small bowls and top with equal amounts of the tuna poke. Serve.