This is a very conforting soup my Mum use to make a lot. Unortunately, I don't have her recipe but recently found this one in our local paper, courtesy of Ike DeLorenzo. He suggests using the best sausage you can find for this dish. His choice, cacciatorini, a dry, aged, spicy salami or pork and beef, or salsiccia Napoletana piccante, an excellent dry sausage from Naples. The use of the Parmedan rind flavors the whole soup.