En papillote, or al cartoccio in Italian, is a method of cooking in which the food is put into a folded pouch or parcel and then baked. This method is most often used to cook fish or vegetables, but lamb and poultry can also be cooked en papillote. It is a combination cooking method of baking and steaming. This method of cooking has been popular since the 17th century in France. From Wikipedia
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