In a food processor or blender, place the basil, walnuts, garlic, and cheese. Drizzle in the olive oil and pulse until the pesto is your desired consistency, adding more oil if necessary.
Before serving this pesto over pasta blending in a couple tablespoons of the hot pasta water can make it easier to work with.
Recipe by Sugar Dish Me at https://www.sugardishme.com/easy-basil-walnut-pesto/