The easiest way to grate a block of cheese is employing a food processor.
Using a large, sturdy knife, cut one block of parmesan cheese into smallish, fairly uniform cubes.
Add the parmesan cubes to a food processor bowl fitted with a steel blade. Process for about 3 minutes, or longer, until the parmesan is finely grated. Transfer to a covered bowl and store in the refrigerator. Keeps well for about two to three weeks.
Grating cheese at home tastes far better than anything out of a can which includes not only the cheese but cellulose as an anti-caking agent. Try the grated parmesan in Caesar salad, stirred into homemade croutons, sprinkled on your favorite pasta dish or as a garnish for garlic bread.