Literally, papillote is the French term for the frilly paper used to decorate the rib bones on crown roasts, ends of lamb chops, etc. But the phrase en papillote refers to baking food inside a wrapping of parchment. Chef Ryan gave us some pre-made (affiliate links) [easyazon_link identifier="B00E4MRH74" locale="US" tag="thskchcaba-20"]parchment envelopes[/easyazon_link] that were slick to use. Otherwise, you can easily make a packet from a half sheet of [easyazon_link identifier="B00K282KY4" locale="US" tag="thskchcaba-20"]parchment paper[/easyazon_link].