Make the Dip: Blend all dressing ingredients until smooth and creamy. Set aside.
Prepare the Rice Paper: Briefly dip a sheet of rice paper into the plate of water and remove immediately — it will continue to soften as you assemble.
Assemble the rolls: Place carrot, cucumber, cabbage, and sashimi on the softened rice paper. Wrap it up tightly, like a popiah (fresh spring roll).
Enjoy immediately, dipping each roll into the savoury-sweet miso carrot sauce.