Measure and prepare all ingredients before starting.

Optional: Toast pistachios in a dry skillet over medium heat for 3-5 minutes until fragrant.

Add pistachios and minced garlic to the food processor and pulse until coarse crumbs form.

Add grated Parmesan cheese and basil leaves; pulse to combine.

With the processor running, slowly drizzle in olive oil until the mixture is smooth and creamy.

Season with salt and pepper to taste and blend briefly to incorporate.

Add lemon juice and pulse just until mixed.

Serve immediately or transfer to an airtight container; drizzle a thin layer of olive oil on top before sealing to prevent browning.