Crossword Genius

Prep dishes? He transformed this dish (9,3)

Ross

I believe the answer is:

shepherds pie

'this dish' is the definition.
(I've seen this before)

'prep dishes? he transformed' is the wordplay.
'transformed' is an anagram indicator.
'prep'+'dishes'+'he'='prepdisheshe'
'prepdisheshe' with letters rearranged gives 'SHEPHERDS PIE'.

(Other definitions for shepherds pie that I've seen before include "Food" , "Mashed potato and minced meat, baked" , "Minced meat topped with mashed potato" , "Meat and mashed potato dish" , "Meat-and-potato dish" .)

I've seen this clue in The Telegraph.
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