Toast Pine Nuts (Optional):
In a small skillet over medium heat, toast pine nuts for 2–3 minutes until golden and fragrant. Let cool.
Blend Ingredients:
In a food processor or blender, combine basil, toasted pine nuts, garlic, and Parmesan. Pulse until finely chopped.
Add Olive Oil:
With the processor running, slowly drizzle in olive oil until the mixture forms a smooth paste.
Season:
Add salt, black pepper, and optional lemon juice to taste. Pulse briefly to combine.
Serve or Store:
Use immediately with pasta, pizza, sandwiches, or as a dip.