Tanabata somen eaten with mentsuyu with tasty dashi (Japanese soup stock) (Umami substance in soy sauce: glutamate 400~1700mg/100g. (Umami substance in mentsuyu dipping sauce *marketed product: glutamate362~660mg/100g. Umami substance in bonito flakes: glutamate 30~40mg/100g, inosinate: 470~700mg/100g)