Tempeh is a mycelium food like "Quorn" it is the underground part of a mushroom so this is not so much cooking as growing.
It can be eaten raw, but normally is used as an ingredient
Tempeh has been made for a long time in the Far east, it is not easily available and it is expensive to buy and cheap to make. It is an unusual food, it is not much like anything else.
If you want to have a go, you need to get some mycelium spores, I get mine over the internet from Erik at http://www.tempeh.info
there are some excellent recipes on that website as well, I recommend tempeh with tahini.
If you want to scare your friends after they have eaten it and made lots of nice compliments you can tell them that it's "mouldy beans" which is almost true.