Devil’s tongue (konyaku) is a health food that can be used in various ways: it can be eaten raw as sliced konyaku (sashimi konyaku), boiled or pot-boiled. Although it is the general practice to use yams for cooking only after it has been reduced to a powder (flour), in recent years the use of yams in our diet has been reviewed and method food preparation using grated raw yams have been considered. Gunma prefecture which produces about 90% of the nation’s konyaku is home to a boisterous effort to develop new ways of using konyaku in cooking.