I have tried it on more than one occasion. It is a skill I certainly lack. 4 out 5 HD foil cooking containers of mine spring a leak. <img src="/images/graemlins/grin.gif" alt="" /> You also (if doing anything more than heating a little water) have to be very careful to have enough heat on the foil to cook and/or boil but not so much that you burn through the foil. It's a delicate balance. It's something Im no good at but I keep practicing every other weekend when I'm camping. Until I master it (if ever) it's gonna have to be MP1 tabs for purification and the PSK tin for heating a little water if needed. Not too concerned about food but if Im cookin squirrel I skewer him I suppose.