A Greek cheese made with the whey from Feta and Kefalotiri, along with sheep and cow's milk, which is used to enrich the cheese. It is sold both fresh and aged. Fresh Mizithra is soft, resembling cottage cheese and the aged is shaped like a large egg and is firm with a pungent aroma and mild flavor. The aged cheese, known as Xinomyzithra, makes a perfect grating cheese. Mizithra is also spelled Myzithra. If fresh mizithra is not available, ricotta can be used for a similar texture.