Wash the perilla leaves and cucumber thoroughly, then julienne them.
Blanch the tofu in boiling water and cool it in cold water.
Cut the tofu into long, noodle-like strips and place them in a bowl.
Place the julienned perilla leaves and cucumber on top of the tofu noodles.
Mix soy sauce, vinegar, sesame oil, and sugar to make the sauce.
Drizzle the sauce over the dish.
Sprinkle with sesame seeds to finish.