Cut a plant, they say it's tasty (10)

I believe the answer is:

piccalilli

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'it's tasty' is the definition.
(tasty pickle relish)

I don't understand how the rest of the clue works.

(Other definitions for piccalilli that I've seen before include "Mixed vegetables in a mustard sauce" , "Spicy pickle" , "Hot pickle" , "Spicy relish" , "Relish with chopped pickled cucumbers, green peppers and onion" .)

I've seen this clue in The Telegraph.

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