Help me please to identify this Chinese plant/dish?
It's difficult to translate names of Chinese dishes into English, because of the huge differences between Chinese and Western cuisine. 

The dish featured on the page is called: 

凉拌贡菜 (liangban gongcai), 
character by character: 


凉 cold
拌 to toss (salad)
贡 to tribute
菜 dish


So it's basically a salad that is served cold. 

The main ingredient is known as 贡菜 (gong cai) in Chinese, which is sometimes also written as 'gong choi' or 'yamakurage' (Japanese name). 

If I am wrong, do correct me.

EDIT: There are some nice photos out there on the dish (gongcai salad) and on the cultivation of gongcai, as well.