Boil the buckwheat noodles and rinse them in cold water.
Slice cucumber, carrot, and pear into thin strips.
Slice red chili pepper and perilla leaves.
Cut sashimi (such as flatfish/rockfish) into bite-sized pieces.
Prepare the seasoning sauce (gochujang, vinegar, sugar, garlic, etc.).
Place the sashimi, vegetables, and buckwheat noodles in a bowl.
Add the seasoning sauce and mix well.