In a food processor
, combine the basil, pine nuts
, Parmesan, garlic
, and salt and puree. While the motor is running, drizzle
in the oil until incorporated. Season with pepper, to taste. Use immediately or store in the refrigerator with a piece of plastic wrap
placed right on the surface of the pesto
to prevent discoloration, for up to 3 days, or freeze for up to 1 month.