Pleased by ‘cake’ that’s reconstituted pulses (5-4,4)

I believe the answer is:

black-eyed peas

I'm a little stuck... Click here to teach me more about this clue!

'pulses' is the definition.
(I know this)

'pleased by cake that's reconstituted' is the wordplay.
'pleased by cake' anagrams to 'BLACK-EYED PEAS'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

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