Which cooking method involves baking food inside a folded pouch?

The method known as "en papillote" involves cooking food inside a folded pouch, typically made of parchment paper. This technique allows steam to build up inside the pouch, which not only keeps the food moist but also allows it to cook evenly and be infused with the flavors of any added herbs, spices, or marinades. The pouch traps moisture and flavors, making it an ideal method for delicate ingredients like fish or vegetables, which benefit from a gentle cooking environment.

In contrast, grilling involves cooking food over direct heat, while frying involves cooking food in hot oil. Poaching also involves cooking food in a liquid, but it does not utilize a pouch to contain the ingredients. Each of these methods has its distinct characteristics, but "en papillote" stands out due to its unique approach to creating a steam-filled cooking environment through the use of a folded pouch.