It is a very long (15-20 inches) & skinny (1/2 in diameter)brown root. It is used in Japanese cooking the most either sliced or julienned before cooking. I think you have to soak it in something to get some of the bitterness out. I forgot what, I know someone can probably help me explain this better, either Jin or Torakris... In Chinese cooking it is used more for herbal/medicinal purposes, and used as a tea or soup. When it is young, it tastes more potato/yam-ish, especially when fried. When it is not as young, it develops a stronger flavor.