In a food processor, combine the pine nuts, lemon juice, garlic, salt, and pepper and pulse until well chopped.

Add the basil and pulse until combined.

With the food processor running, drizzle in the olive oil and pulse until combined.

For extra cheesy flavor, add 1 tablespoon nutritional yeast. For brinier flavor, add 2 teaspoons capers. For more umami, add 2 oil-packed sun-dried tomatoes. Briefly pulse to combine. Taste and adjust, adding more nutritional yeast, capers, or sun-dried tomatoes, as desired. For a smoother pesto, add more olive oil.