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
Stilton cheese Stilton cheese Stilton is an English cheese, produced in two varieties: Blue, known for its characteristic strong smell and taste, and the lesser-known White. Both have been granted the status of a protected designation of origin by the European Commission, which requires that only cheese produced in the three counties of Derbyshire, Leicestershire, and Nottinghamshire and made according to a strict code may be called "Stilton". Thus cheese made in the village of Stilton which is now in Cambridgeshire (from where its name was derived in the 18th century) could not be sold as "Stilton". Frances Pawlett (or Paulet), a