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40 g de farine
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40 g de beurre
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20 cl de vin blanc sec (Sauvignon)
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1 oignon paille
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2 échalotes
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10 cornichons au vinaigre
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1 tablette de bouillon de buf
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1 cuillère à soupe de concentré
de tomates
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1 cuillère à soupe de vinaigre
de vin
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4 brins de persil
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Sel fin, poivre moulu