A vegetable as a leek may be (3,4)

I believe the answer is:

sea kale

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'a vegetable' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'as a leek may be' is the wordplay.
'may be' is an anagram indicator.
'as'+'a'+'leek'='asaleek'
'asaleek' anagrammed gives 'SEA-KALE'.

Can you help me to learn more?

(Another definition for sea kale that I've seen is " Maritime cabbage".)

I've seen this clue in The Globe and Mail.

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