Blue cheese of blue veins. The distinctive flavor and aroma of blue cheese arises from methyl ketones (including 2-pentanone, 2-heptanone, and 2-nonanone) which are a metabolic product of "Penicillium roqueforti". These compounds are not formed in other types of cheese fermented by bacterial acidification alone. In the European Union, many blue cheeses, such as Cabrales, Danablu, Gorgonzola, Roquefort and Blue Stilton, carry a protected designation of origin, meaning they can bear the name only if they have been made in a particular region. Similarly, individual countries have protections of their own such as France's Appellation d'Origine Contrôlée and Italy's Denominazione di Origine
Šar cheese in the original days there was only sheep milk used. Šar cheese Šar cheese (, ) is a hard cheese made in Gora, Opolje and Štrpce, located in the Šar Mountains of Kosovo. It is made of sheep and cow milk and usually added to salads and main dishes, pitas, served with bread or eaten alone. The hallmarks of the cheese are its saltiness, and the fact that it is a treat for any time of the day or year. The tradition of producing Šar cheese has been passed on to generations for centuries. By the 1890s, the cheese became