Using freshly grated Parmesan is key for our family. I buy a 1/2 lb. block of Parmesan Reggiano, chop up into 1 inch cubes (discard rind), and throw it in a food processor. Grate until cheese is the size of breadcrumbs. (Fresh Parmesan is better in quality and taste, compared to the store-bought kind that has caking agents, and the food process method makes cheese be uniform in size).