Vichyssoise need (4)

I believe the answer is:

leek

(Other definitions for leek that I've seen before include "Onion-like vegetable" , "Green and white vegetable" , "Vegetable related to onions" , "Plant related to the onion, pair with potato for soup" , "Vegetable - Welsh emblem" .)

I've seen this clue in the LA Times.

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