Insert kitchen shears into the carcass and make a few cuts to get you started. Then, use your hands to carefully pull the carcass into 4 or 5 pieces.
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Combine the carcass, onions, carrots, celery, parsley, garlic, peppercorns and bay leaves in a stockpot. Cover with cold water (about 7 quarts).
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Bring to a boil, then reduce the heat to medium low. Simmer about 2 hours, occasionally skimming any foam or fat from the surface with a large spoon or ladle.