Combine all ingredients in a 6 litre pot and add water to cover. Bring to a boil, then reduce heat and simmer gently, uncovered, for 1.5 hours, skimming the top as necessary. Remove and discard the large bones. Pour the stock through a large strainer lined with a double thickness of cheesecloth. Refrigerate the stock until the fat solidifies, then remove and discard fat. Transfer the stock to conveniently sized containers and refrigerate for 2 days, or freeze.
Makes 4 cups.