Make Feta Cheese
Traditionally (and legally within the EU), feta is produced using only whole sheep's milk, or a blend of sheep's and goat's milk (with a maximum of 30% goat's milk).
The milk may be pasteurized or not, but most producers now use pasteurized milk. If pasteurized milk is used, a starter culture of micro-organisms is added to replace those naturally present in raw milk which are killed in pasteurization.These organisms are required for acidity and flavour development.
When the pasteurized milk has cooled to approximately 35 °C (95 °F), rennet is added and the casein is left to coagulate. The compacted curds are then chopped up and placed in a special mould or a cloth bag that allows the whey to drain.
After several hours, the curd is firm enough to cut up and salt; salinity will eventually reach approximately 3%, when the salted curds are placed (depending on the producer and the area of Greece) in metal vessels or wooden barrels and allowed to infuse for several days.
After the dry-salting of the cheese is complete, aging or maturation in brine (a 7% salt in water solution) takes several weeks at room temperature and a further minimum of 2 months in a refrigerated high-humidity environment—as before, either in wooden barrels or metal vessels, depending on the producer (the more traditional barrel aging is said to impart a unique flavour).
The containers are then shipped to supermarkets where the cheese is cut and sold directly from the container; alternatively blocks of standardized weight are packaged in sealed plastic cups with some brine. Feta dries relatively quickly even when refrigerated; if stored for longer than a week, it should be kept in brine or lightly salted milk.