Greek feta cheese P.D.O.* Soft cheese from pasteurized Greek sheep’s and goat’s milk. (PROTECTED DESIGNATION OF ORIGIN) Feta P.D.O. is produced in a special way, boiled at low temperatures, 65 degrees for 30 minutes in an open boiler so that the nutrients are not destroyed. Also, for the Feta in barrels with brine, Feta is stored and matured in oak barrels.