Pyongyang ''raengmyŏn'' was originally eaten in homes built with ''ondol'' (traditional underfloor heating) during the cold winter, so it is also called ''"Pyongyang deoldeori"'' (shivering in Pyongyang). Pyongyang locals sometimes enjoyed it as a ''haejangguk'', which is any type of food eaten as a hangover-cure, usually a warm soup.