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
Manufacture of cheddar cheese Manufacture of cheddar cheese The manufacture of Cheddar cheese includes the process of "cheddaring", which makes this cheese unique. Cheddar cheese is named for the village of Cheddar in Somerset in South West England where it was originally made. The manufacture has since spread around the world and the name has become generic. In general, the milk is raw milk (whole or 3.3%). The milk must be "ripened" before adding in the rennet. The term "ripening" means allowing the Lactic acid bacteria (LAB) to turn lactose into lactic acid, which lowers the pH of the solution, greatly aiding in the