Green Basil Sauce, also known as Pesto, is a traditional Italian sauce made from fresh basil, garlic, olive oil, pine nuts, and Parmesan cheese. It is usually served over pasta or used as a condiment for meats and vegetables. Pesto is a popular dish in many parts of the world and is often used as a topping for pizza or as an ingredient in salads. The bright green color of the sauce comes from the fresh basil leaves, which give it a unique flavor and aroma.