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
Muenster cheese made from unpasteurized cow’s milk in the Alsatian Vogesen Mountains in Alsace. A regional variation is also produced in the Franche-Comté region in France. The name Munster-Géromé, used today in France, is a protected A.O.C. and is strictly regulated in its production technique and source geography. The American "muenster" name distinguishes these cheeses. Its taste varies from bland, like a white American cheese, to sharp, like a Monterey Jack cheese. Muenster is pale in color and smooth in texture with an orange rind. The cheese is made from cow's milk. The rind's orange color is from annatto, a sweet and