The main ingredient in traditional pesto is basil. Pesto is a vibrant green sauce originating from the Liguria region in Italy, typically made from fresh basil leaves, garlic, pine nuts, Parmesan cheese, and olive oil. The fresh basil imparts a distinctive aroma and flavor that is central to the dish. While traditional pesto uses a mortar and pestle to achieve its creamy consistency, modern recipes often utilize blenders or food processors. Pesto is commonly enjoyed with pasta, as a spread on bread, or as a marinade for meats and vegetables, showcasing the versatility of its delightful flavor.