Yes, left over cheese charges from mortars makes for good firemaking, and not as messy as kerosene or other liquid fuels.
Just don't make the same mistake as one chap who tried to make fire with some granulated powder he found in a bag stored in one of the old cannon bunkers.
It turned out to be a left over "cartouche" for a 150 mm. gun with separate loads, and the cartouche-bag contained blackpowder!
It went off with a "WHOMP" and he found himself sitting on a collapsed tent with a new hairdo and a face tint normally seen on rap-singers while the twigs and branches that was supposed to be a camp fire rained down on him...
Would have given anything to actually see that, but as I was at the machinegun post I only heard it.
The guy was pretty shaky afterwards, but no severe burns.
