It sounds a bit upscale, but
en papillote (pronounced ahn pa-pea-yawt) is actually a quick and easy way to cook delicate foods like fish. It literally means “in paper” or “in parchment.”
This French cooking technique calls for steaming food by enclosing it in parchment paper and baking it in the oven. Cooking in this manner typically calls for adding citrus slices, herbs and a small amount of liquid such as wine, juice or stock to the packet along with vegetables and seafood or chicken.
The key to proper cooking is making sure to fold the ends of the paper well in order to keep the steam and liquid inside the packet. Although parchment paper is traditionally used, aluminum foil works as well.