Crunchy stem of an aquatic plant, used in Chinese cuisine (5,8)

I believe the answer is:

water chestnut

(Other definitions for water chestnut that I've seen before include "Tuber used in oriental cookery" , "Vegetable used in oriental cookery" , "Crunchy Chinese vegetable" , "Edible tuber used in Chinese cuisine" .)

I've seen this clue in The Guardian.

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