Sharp, sweet or savoury dish (4)

I believe the answer is:

tart

This clue is a double definition.

'sharp' is the first definition.
(I know that sharp can be written as tart)

'sweet or savoury dish' is the second definition.

(Other definitions for tart that I've seen before include "sour type of pie" , "Acidic in taste" , "Open cake with jam etc" , "Open fruit pie" , "Sour-tasting pie?" .)

I've seen this clue in The Telegraph.

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