Boil the buckwheat noodles, rinse them in cold water, and drain well.
Boil pork (for suyuk) with onion, green onion, and garlic until cooked, then slice into bite-sized pieces.
Evenly spread the buckwheat noodles over a sheet of seaweed for gimbap.
In order, add the boiled pork, julienned cucumber, julienned carrot, pickled radish, and perilla leaves.
Carefully roll the ingredients into a gimbap shape.
Cut into bite-sized pieces and serve with mustard sauce or soy sauce if desired.