Pesto is a traditional no-cook Italian sauce with main ingredients of basil, pine nuts, and Parmesan cheese, all crushed together with a mortar and pestle. Using a food processor takes the hard labor out of the recipe, and alternating the main ingredients results in many varieties of pesto. Versatile and simple to make, pesto is a great way to add color and a gourmet touch to a home-cooked meal. Keep a batch around to season pasta, vegetables, and sandwiches. Use it as a sauce, a spread, or a dip—the possibilities are endless!