Wash the basil leaves thoroughly.
In a food processor, combine the basil leaves, pine nuts, and garlic.
Pulse until finely chopped.
Scrape down the sides of the bowl.
Add the grated Parmesan cheese.
With the processor running, slowly drizzle in the olive oil.
Season with salt and pepper to taste.
Blend until desired consistency is reached.
Taste and adjust seasonings as needed.
Transfer to a jar and drizzle olive oil on top.