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
Pouligny-Saint-Pierre cheese are left for up to five weeks. Production now occurs all year round although farmhouse manufacturers produce between spring and autumn. Pouligny-Saint-Pierre received AOC status in 1976. 294 tons were produced in 2005 of which 55% was "fermier". Pouligny-Saint-Pierre cheese Pouligny-Saint-Pierre is a French goats'-milk cheese made in the Indre department of central France. Its name is derived from the commune of Pouligny-Saint-Pierre in the Indre department where it was first made in the 18th century. The cheese is distinctive, being pyramidal in shape and golden brown in colour with speckles of grey-blue mould, and is often known by the