INGREDIENTS
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1/4 pound (1 stick) unsalted butter
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1 1/2 cups chopped yellow onion (2 onions)
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1/4 cup flour
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1 teaspoon kosher salt
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1/2 teaspoon freshly ground black pepper
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Defatted turkey drippings plus chicken stock to make 2 cups, heated
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1 tablespoon Cognac or brandy
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1 tablespoon white wine, optional
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1 tablespoon heavy cream, optional