It sounds incredible, but you can make a warm meal with canned tuna. You can cook rice or pasta with it, and then use the tuna for sauce!
Who would have thought it could come from something as primitive as it is canned tuna, we produce burner? All you need is a few unscented pieces toilet paper, which you place over the oil in which the tuna is swimming, so that they absorb it. You light it and you can use the flame to cook lunch or warm yourself.
More. You don't destroy the tuna with this, and you can then calmly mix it into your meal or you eat besides.
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The next time you go on a trip and plan a meal in the heart of nature, impress your friends with it cool and cheap gimmick.