Wash perilla leaves thoroughly and slice thinly.
Julienne cucumber and carrot thinly.
Boil somyeon noodles in boiling water, rinse in cold water, and drain well.
Mix soy milk, salt, pepper, sesame seeds, and vinegar to make a cold broth.
Place the noodles in a bowl and top with the prepared vegetables and perilla leaves.
Pour the cold soy milk broth over the noodles.
Finish by drizzling sesame oil and sprinkling sesame seeds.