You just make a few cuts drill some holes, spray paint a bit, and your done. Just pour some alcohol down the middle, light it, wait till the alcohol starts boiling then the flames will come out of the holes on the sides, because of pressure, then put your pan on and our done.
I spray painted, in internally cause it helps it to burn the alcohol. I have used this at least almost all the time i go camping. Before you pout the alcohol if you throw in a bit of spray paint it is awesome.