In the picturesque landscapes of Greece, an extraordinary cheese known as graviera (γραβιέρα in Greek) has stood the test of time, captivating taste buds with its distinctive flavors and artisanal craftsmanship. Graviera is a hard yellow cheese made from sheep or a mix of cow, goat, and sheep milk. It resembles the Swiss Gruyère, which in Italian is called Griviera. Even though both kinds of cheeses have a similar ripening process, they have different tastes and textures. This is because, unlike graviera, the Swiss Gruyère is made only from cow milk. Graviera is the second most popular cheese in Greece right after the famous feta cheese. PDO stands for "Protected Designation of Origin." It is a legal designation used in the European Union (EU) to protect the names of certain agricultural products, including foods and beverages, that are produced in specific geographical regions using traditional methods. The purpose of PDO is to preserve the authenticity and quality of thes