Pesto (or sub store-bought): Add ingredients to a small food processor or blender. Blend until smooth. Taste and add additional salt, as desired. Add additional olive oil, a tablespoon at a time, to thin.
Pasta + Pasta Water: Cook pasta al dente according to package instructions. Remove approx. 1/2 cup pasta water and then drain pasta. Return to warm pot along with the pesto and a splash of paster water (set remaining pasta water aside).
Sauce it up: Stir and let the hot pasta water create a beautiful, thinned out pesto sauce that will coat your noodles beautifully! Add additional splashes of pasta water, as needed, to reach your desired consistency (you may not use it all).
Serve: Serve with some grated or shaved parmesan cheese for garnish.