I suppose no stove at all - just a small fire - is the ultimate
Having said that, I'm getting one of these Honey stoves
The Honey Stove 09
as it looks like a really flexible solution. I'm getting a bit sick of lugging the Trangia around.
Another option is a stainless cutlery thingy (like a tin can with holes in the sides and bottom!) you can get at your local supermarket for a couple of quid. I've got a pal who swears by them.