Green trattoria topping (5)

I think it could be either:

Which length description are you looking for?:

pesto

(Other definitions for pesto that I've seen before include "Basil-based sauce" , "Italian sauce containing basil" , "Basil and pine nut sauce" , "Sauce of basil, pine nuts and garlic" , "Pasta sauce variety" .)

I've seen this clue in The New York Times.

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