Combine basil leaves, pine nuts and garlic in a food processor and process until very finely minced. Add the lemon juice and parmesan cheese.
With the machine running, slowly stream in the oil and process until the mixture is smooth.
Notes
Storage: Store the pesto in an airtight container in the fridge for up to 7 days. You can place a plastic wrap directly on the pesto to help slow down oxidation.Photo Credit:Erin Jensen