Here's a cute idea from CHOW and Chris Rochelle for baking chocolate cakes in campfire coals, using scooped-out orange peels as molds:
Cut the tops off about 10 oranges and scoop out the pulp. Fill the oranges three-quarters of the way with chocolate cake batter (cake mix works fine), then put the orange tops back on and wrap each orange in aluminum foil. Place directly onto the smoldering coals of the campfire, avoiding any intense flames, and cook for about 30 minutes, turning once or twice.
I've had sorbet served in an orange and pate served in an orange (AKA "meat fruit). Both were delicious. You could probably do a whole meal inside of citrus peels.