This is the hard bit at the end of a fresh chunk of parmesan cheese. I love to add a piece of Parmesan rind when making soups, stews or sauces since it adds a boost of flavour and richness. Just remember to remove it before serving! Simply save the rind from your Parmesan in a freezer bag and store in the freezer until you need it. They are also available to purchase at some cheese counters.