Puréed vegetables, traditionally served with fish and chips (5,4)

I believe the answer is:

mushy peas

(Other definitions for mushy peas that I've seen before include "Pulpy green food" , "Squashed green foodstuff" , "Vegetable to go with fish and chips?" , "Accompaniment to fish?" , "Processed vegetables" .)

I've seen this clue in The Guardian.

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