you would hcarve a bowl into the apple with some small holes leading to a carvd out center and have a small hole in the side so you can suck in the smoke. its tasty too
THe tin will burn and you'll inhale the tin smoke, thus giving you terrible lungs and all sorts of gross stuff in your body.
Core the apple kind of like a pumpkin, so the top of the core can sit on top of the apple again. That would work alot better.