en papillote
US /ˌɑːn pæpɪˈloʊt/
UK /ˌɑːn pæpɪˈloʊt/

1.
en papillote, a la papillote
a method of cooking in which food is enclosed in a packet of parchment paper or foil and cooked in the oven, allowing the food to steam in its own juices and flavors
:
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The chef prepared the salmon en papillote with herbs and lemon.
El chef preparó el salmón en papillote con hierbas y limón.
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Cooking vegetables en papillote keeps them tender and flavorful.
Cocinar verduras en papillote las mantiene tiernas y sabrosas.