Water __, Edible Tuber Used in Chinese Cookery
Puzzle 15 of Good luck Easy Pack
Question is: Water __, Edible Tuber Used in Chinese Cookery
and the answer is: CHESTNUT
Word Meaning:
CHESTNUT — (countable) An edible nut (technically a fruit) of the Spanish chestnut or sweet chestnut tree (Castanea sativa); also (chiefly preceded by a descriptive word), a nut from a related shrub or tree; or a similar nut from an unrelated plant.
Definitions from Wiktionary.