Konjac

Good sign: usually fine for vegans.

Also spotted as

蒟蒻konnyaku

konjac, in kanji

しらたきshirataki

konjac noodles

糸こんにゃくito konnyaku

thin konjac strands

Where you'll find it

Oden, sukiyaki, nabe, low-calorie noodles, jelly drinks.