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Prepare a mazzetto guarnito (see “Making a Mazzetto Guarnito”) with aromatic vegetables cut into 3- to 5-centimeter (13/16- to 2-inch) chunks and tied in cheesecloth for ease of removal. (The choice of aromatics is personal to the chef but carrot, celery, onion, fresh rosemary, sage, and black peppercorns are common.) Prosciutto skin, ends, or bones may be added for additional flavor, as well as the rinds from Grana Padano or Parmigiano-Reggiano cheese.
