In a food processor, combine the pine nuts, garlic cloves, fresh squeezed lemon juice, nutritional yeast and olive oil. Pulse until the mixture is finely chopped. Process until combined.
Add the fresh basil leaves and process until incorporated. If you would like a thinner pesto, add an additional 1/4 cup of olive oil (or water).
Transfer the pesto to a jar or airtight container. Store in the refrigerator for up to a week, or use immediately to enhance your favorite dishes.