http://www.washingtonpost.com/lifestyle/food/smoke-signals-cooking-in-not-on-the-fire/2014/09/16/790d0940-386c-11e4-9c9f-ebb47272e40e_story.html?wpisrc=nl-headlines&wpmm=1I remember reading once about Dwight D. Eisenhower using this method. The article goes into a bit more details about how he did it.