Add the basil leaves, pine nuts, and garlic to a food processor and pulse until all ingredients are roughly chopped.

Add the Parmesan cheese and pulse again to combine.

While the food processor is running, slowly drizzle in the olive oil until the mixture is smooth and well blended.

Season with salt and freshly ground black pepper to taste.

Use immediately or store in an airtight container in the refrigerator for up to a week.