In "Oraimono" (a primary textbook in the style of exchanging of letters), which said to have been written by Kanera ICHIJO, there is a passage that states that somen noodles are steamed, and kirimugi noodles (cold noodles) are cold washed.
一条兼良が書いたとされる『往来物』には索麺は熱蒸、截麦（きりむぎ）は冷濯（ひやしあらい）との一節がある。