Sardo is a hard, grating cow's milk cheese

Cheese

Cheese is a generic term for a diverse group of milk-based food products. Cheese is produced throughout the world in wide-ranging flavors, textures, and forms....

 that is similar to Pecorino Romano

Pecorino Romano

Pecorino Romano is a hard, salty Italian cheese, suitable primarily for grating, made out of sheep milk . Pecorino Romano was produced in Latium up to 1884 when, due to the prohibition issued by the city council of salting the cheese inside their shops in Rome, many producers moved to the island of...

, although the latter is made from sheep's milk and is sharper. Sardo comes from Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

, and is not to be confused with Pecorino Sardo

Pecorino Sardo

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. It was awarded Denominazione d'Origine status in 1991 and granted Protected designation of origin protection in...

, another Italian sheep's cheese. Sardo is traditionally coagulated by animal rennet

Rennet

Rennet is a complex of enzymes produced in any mammalian stomach to digest the mother's milk, and is often used in the production of cheese. Rennet contains many enzymes, including a proteolytic enzyme that coagulates the milk, causing it to separate into solids and liquid...

 which is the inner lining of the fourth stomach of calves and other young ruminants. Therefore, it is not a vegetarian cheese. Its flavor is mellow, yet rich, and lightly salty. It is white-yellowish in color and is sold in blocks of about 6.5 pounds. Sardo cheese meets the U.S. Standards of Identity for cow's milk. It makes a good choice for snack cheeses or for cooking purposes.