So I know this isn't any kind of high tech rocket stove, but for a couple cans of soup and a few spare minutes, I thought it worked pretty good. I used a large soup can and a regular sized one. I tried to illustrate the set up in the picture below. I was able to run the thing off a very small handful of twigs for a good amount of time. I'll do more tests with it soon to find out how efficient it really is (if at all). It sure is fun making stuff out of trash!