2018-11-12 · Classic pesto sauce with basil. First, let’s study the classic pesto sauce. The classic pesto sauce is a no-cook sauce made from fresh basil, olive oil, garlic, roasted pine nuts, and Parmesan cheese (Parmigiano Reggiano and/or Pecorino Fiore Sardo). Purists will continue to use those ingredients, and make the sauce with a mortar and pestle.