I picked up this fold-able portable stove at Fleet Farm. It cost less than $4.00. Total weight is about 9 ounces.
It is supposed to be used with Sterno fuel, but instead, I used small twigs and pine-cones. The sticks need only be about the diameter of a pencil. A small pinecone would almost be too much.
I was impressed at how much cooking we could do with so little fuel. I cooked a three course meal for two with about two fistfuls of twigs. Well, the "three-courses" were roasted sausages on buns, baked beans (from a can), and coffee.
It started fast, cooked fast, and then afterwards we sat around the small fire in the stove for camp stories and relaxation.
I have visited national and state forests that have been picked over so clean that you can't have a campfire without bringing your own lumber, but this stove is so efficient that even the barest of locations would have fuel enough to cook dinner. You could probably cook a meal on this with dried grass or an old newspaper if you had to.
You can click on the pics for a larger image.