Daily Concepts Konjac Sponge Turmeric is a traditional Japanese jelly-like food, made from a kind of potato called "Konnyaku potato". Konjac has been traditionally used in Japan as a beauty treatment for a long time due to its properties. The Konjac sponge is highly absorbent in both water and oils and is excellent for a thorough cleansing. It also has great function to break down skins dirt and balance pH.