An Italian cheese made from sheep's milk, which is available fresh or aged. The fresh Pecorino cheese is a soft, white cheese with a mild flavor called Ricotto Pecorino. The most popular of the aged Pecorino is the Pecorino Romano, which has a hard yellow rind with a yellowish white interior. Two other popular aged Pecorino cheeses are Pecorino Sardo and Pecorino Toscano. Aged Pecorino has a salty, tangier flavor than fresh. Pecorino cheese is a good grating cheese and melts nicely in sauces and on pasta.