Konnyaku refers to the Japanese firm jelly made from Konnyaku flour. Hijiki are added in the jelly. Konnyaku is not sweet and does not have much taste itself. Konnyaku is very popular because it is low in calories and high in fiber. Konnyaku is also known as "konjac, konjaku, devil ’s tongue, voodoo lily, snake palm, or elephant yam”. It is a natural food made from a type of mountain potato mixed with calcium hydroxide or calcium oxide extracted from eggshells. It is a traditional Japanese health food and has been consumed for over 2000 years. It appears in many dishes in Japanese cuisine such as Oden, Sukiyaki and Sashimi. Besides that, it is also widely used as a substitute for gelatin in making jelly dessert, and is recently eaten as jelly or instant soup.