That´s pretty easy, you need an apple, a screen, made of punctured alu-foil, or a regular screen, and a pencil.

You use the pencil to pierce a hole in the apple from the top, until appr. the middle of the apple.
Then you pierce the apple from the side, connecting that hole with the one you made before, so you have created a channel to suck through.

Place the screen in the dent on top of the apple, covering the pencil hole, and fill it with delicious hash and/or grass.

Suck on the hole on the side of the apple, while holding a lit lighter to the cannabis in the little bowl, and inhale deeply.

Pass to a friend after 3 sucks....

Note: The author of this manual can not be held responsible for people being floor´ed by smoking an apple!