Mix chopped green onion, chili peppers, minced garlic, soy sauce, sugar, plum extract, red pepper powder, ground sesame, sesame oil, and vinegar in a bowl to create the sauce.

Boil 200g of somen noodles in a pot of boiling water. Optionally add a small amount of cooking oil to prevent sticking. Cook for 3–5 minutes, depending on the quantity, then rinse in cold water and drain.