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
Tyrolean grey cheese the availability of low fat milk after the fat had been taken for use in butter making. Tyrolean grey cheese Tyrolean grey cheese (Graukäse) is a strongly flavoured, rennet-free cows-milk acid-curd cheese made in the Tyrolean Alp valleys, Austria. It owes its name to the grey mold that usually grows on its rind. It is extremely low in fat (around 0.5%) and it has a powerful penetrating smell. The cheese is registered as protected designation of origin under the official name Tiroler Graukäse g.U. The registration of the PDO states that its production has been a significant element of Tyrolean