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6 tablespoons unsalted butter
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½ cup white onion, finely minced
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2 garlic cloves, finely chopped
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½ cup celery, cut in large pieces
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1 lb (425 g) chicken liver
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2 tablespoons Cognac or Port
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½ teaspoon ground allspice
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5 teaspoons water-packed green peppercorns, drained
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