Pecorino sardo, also known as fiore sardo, is a firm cheese from the Italian island of Sardinia which is made from sheep milk: specifically from the milk of the local Sardinian breed. Its flavour is different from that of the Pecorino Romano, which is also made on the island. Sardo is richer while romano is much more biting and salty. Pecorino sardo is delicious in contexts where the romano could overpower, such as in pesto the Ligurian pesto alla genovese is traditionally made with a mixture of Pecorino sardo and Parmigiano-Reggiano or with fruit.
Pecorino sardo is an uncooked hard cheese made from fresh whole sheep's milk curdled using lamb or kid rennet. The mixture is poured into moulds that will give the cheese its characteristic shape. After a brief period in brine, the moulds are lightly smoked and left to ripen in cool cellars in central Sardinia. The average weight of the finished product is 3.5 kg: sometimes a bit more, sometimes a bit less depending on the conditions of manufacture.
The rind varies from deep yellow to dark brown in colour and encases a paste that varies from white to straw-yellow. The sharpness of the flavour depends on the length of maturation. In the United States it is most often found as a hard cheese, its more mature form.