
Konnyaku (こんにゃく) is a rubbery and somewhat flavorless food that appears in certain Japanese dishes. It has a consistency that’s like a cross between a rubber sole and Jell-O that gives your teeth a funny sensation when you bite into it.
I was eating it the other day in a bowl of oden (おでん – a type of Japanese stew) and it occurred to me that I had no idea what it was. Is it a fish? Is it some kind of vegetable pulp or gelatinized seaweed?
It turns out that konnyaku is a jelly made from a type of potato. The potato in question is known in English as konjac (its scientific name is amorphallus konjac – definitely doesn’t sound like something you want to eat).
Konnyaku is a taro-like potato that grows in tropical and sub-tropical Asia. Almost all of Japan’s konnyaku comes from the northern Kanto region and Gunma Prefecture in particular. Other colorful names for the potato are devil’s tongue, voodoo lily, elephant foot and snake palm.
Photo by avlxyz

How Konnyaku Goes from Potato to Wobbly Slab
I’ve never made my own konnyaku, but from what several octogenarians in my neighborhood have told me, it goes something like this. The potato is warmed and softened and then mixed with water. Once the mixing is complete, it’s dried out and ground. It’s then mixed with ash from burnt green oak wood to give it its stiff consistency. Then, it’s patted into shape and boiled. Konnyaku comes in several different forms. It’s most often found as a thick grey slab called itakonnyaku (いたこんにゃく). It also comes in stringy noodles which can be either the thin shirakonnyaku (しらこんにゃく) or itokonnyaku (糸こんにゃく), or the thick tsukikonnyaku (つきこんにゃく). Sometimes it’s rolled into little balls called tamakonnyaku (玉こんにゃく).
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