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this is called a swedish flame. make your cuts like youre cutting cake. leave about 6 inches at the base. throw some fuel oil in there. (about a cap full.) it burns up to two to three hours.
Source link: http://comfyho.me/2013/12/15/this-is-called-a-swedish-flame-make-your-cuts-like-youre-cutting-cake-leave-about-6-inches-at-the-base-throw-some-fuel-oil-in-there-about-a-cap-full-it-burns-up-to-two-to-three-hours/