Blue cheese is made of cow’s milk and has a distinctive tangy flavor. It is white, with blue streaks and
has a crumbly texture, similar to Roquefort cheese. Blue cheese is believed to have been discovered by accident. The caves in which early cheeses were aged shared the properties of being temperature and moisture controlled environments, as well as being favorable to many varieties of harmless mold.
In the European Union many blue cheeses such as Roquefort, Gorgonzola 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 in a certain country. The basic ingredients include blue cheese, mayo, sometimes buttermilk or sour cream, pepper, and sometime worcestershire sauce or vinegar. (Watch How to Make Blue Cheese Dressing)