Which of these indispensable, modern baker's helpers is traditionally used to prepare fish en papillote, a.k.a. fish baked in a closed pouch?

Answer Parchment paper

Baking parchment is a paper that has been specially treated to release foods easily and prevent sticking. It can be used to line baking sheet or pans, layered between baked goods in a container, or turned into a container for the famous French technique "en papillote". Parchment forms a loose pouch around the food, which is then bathed in steam, infusing the food with the flavors of herbs or citrus placed within the pouch, too.

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