Thought I'd have a go at making one of these last night. You fill an old Salmon/Tuna can with corrugated cardboard, add a Jute wick and then fill the whole thing with molten wax. I've not tried it yet but the cardboard is supposed to burn down like a wick resulting in a large flame over the entire surface of the tin. It is said that these can even act as an emergency stove. Anyone else tried one before ?