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usually uncountable, plural pestos
A sauce, especially for pasta, originating from the Genoa region in Italy, made from basil, garlic, pine nuts, olive oil and cheese (usually pecorino). quotations examples
Inside the house, Paul is in the kitchen bent over a bowl of pesto: thick shiny basil leaves, machete-crushed garlic cloves, pine nuts, onions roasted till their gold edges blacken, and the bright scent of lemon zest.
2019, Ocean Vuong, On Earth We're Briefly Gorgeous, Jonathan Cape, page 221