Naengmyeon (냉면, in South Korea) or raengmyŏn (랭면, in North Korea) is a noodle dish of North Korean origin which consists of long and thin handmade noodles made from the flour and starch of various ingredients, including buckwheat (메밀, memil), potatoes, sweet potatoes, arrowroot starch (darker color and chewier than buckwheat noodles), and kudzu (, chik). Buckwheat predominates (despite the name, it is not a wheat but rather is more closely related to sorrel). Other varieties of naengmyeon are made from ingredients such as seaweed and green tea. In modern times, the mul naengmyeon (물냉면) variant is commonly associated with and popularly consumed during the summer; however, it was historically a dish enjoyed during winter.

Pulled from Wikipedia.