Spinach in prescribed course such as tratt serves (7)

I believe the answer is:

lasagne

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

'spinach in prescribed course' is the definition.
'lasagne' can be an answer for 'course' (I've seen this before). I'm not sure about the 'spinach in prescribed' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for lasagne that I've seen before include "Italian cooking" , "Course" , "Sheet pasta" , "Fool ran as angel (anag) - pasta dish" , "Wide flat strips of pasta" .)

I've seen this clue in The Times and The Sunday Times.

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