Such food is prepared purely for Jews (6)

I believe the answer is:

kosher

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'such food' is the definition.
'kosher' can be an answer for 'food' (kosher is a kind of food). I am unsure of the 'such' bit.

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

Can you help me to learn more?

(Other definitions for kosher that I've seen before include "Pure (Jewish)" , "Conforming to Jewish dietary law" , "Legitimate (according to Jewish laws)" , "Genuine and legitimate (informal)" , "In accordance with Jewish law" .)

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

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