Pecorino Romano is a hard, salty Italian cheese, made out of sheep's milk. Pecorino Romano was a staple in the diet for the legionaries of ancient Rome. Today, it is still made according to the original recipe and is one of Italy's oldest cheeses. Most of its production occurs in Sardinia. On the first of May, Roman families traditionally eat Pecorino with fresh fava beans during a daily excursion in the Roman Campagna. It is mostly used in Central and Southern Italy.