Pecorino Romano PDO is a type of hard cheese made from sheep's milk, which is produced exclusively in certain regions of Italy, including Sardinia, Lazio, and parts of Tuscany. It is a PDO (Protected Designation of Origin) product, meaning that it must be made following strict production guidelines to ensure its quality and authenticity. The cheese is typically aged for at least eight months, and often up to a year or more, resulting in a sharp, salty flavour and a firm, granular texture. It is commonly used as a grating cheese, similar to Parmesan, and is often used in Italian dishes such as pasta dishes, risotto, and salads.