Parmigiano-Reggiano
A wonderful grating cheese, Parmigiano-Reggiano is an ivory-colored cow's milk cheese with a distinctive salty flavor.

Pecorino Romano
A pleasantly salty Italian sheep's milk cheese with a grainy texture, primarily used for grating.

Adapted from Williams-Sonoma Kitchen Companion: The A to Z Guide to Everyday Cooking, Equipment and Ingredients (Time-Life Books, 2000)