Spread of mashed avocado, tomatoes and chopped onion (9)

I believe the answer is:

guacamole

(Other definitions for guacamole that I've seen before include "Avocado dip" , "Mexican dish" , "tasty dip" , "Avocado-based dish" , "Mashed avocado dish" .)

I've seen this clue in The Mirror.

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