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Heat 1½ teaspoons oil in a large heavy saucepan over medium heat. Add chopped onion, carrots, celery and the turkey neck and giblets. Cook, stirring occasionally, until well browned, about 15 minutes. Pour in chicken stock and bring to a boil. Reduce the heat to low and simmer, partially covered, for 30 minutes. Strain the giblet stock through a fine sieve (you should have about 2 cups). Chill until ready to use.
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2
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Add Madeira to the roasting pan and cook, stirring and scraping up any brown bits, for about 1 minute; strain into a medium saucepan. Skim the fat from the giblet stock and add the stock to the pan. Skim the fat from the chilled pan juices and add the juices to the pan as well. Bring to a simmer. Add the cornstarch mixture to the simmering sauce, whisking until the gravy has thickened slightly. Season with pepper.
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