The picture above may look like a sickly amoeba; but it's fish, cooked in a very convenient and mess-free way: in parchment paper, or, en papillote The very first time we tried this, it turned out perfectly. If you line your baking sheet with foil, there's little clean-up, and if you've never created a parchment packet, there will be a tutorial in Chef John's video below. This is an especially good way to cook fish as it always comes out very moist and tender. But there are other ways to do 'food in packets', including Hobo Packs, a traditional Boy...