Related: a guy in Poland posted online about buying supermarket donuts to use as fuel in a wood-burning stove. The donuts turned out an order of magnitude cheaper than firewood.
That suggests you could mix flour and vegetable oil and maybe dry it into bricks which might be cheaper than donuts usual are. I wonder how dirty that burns…
Could be. A little char can make things easier to light. But I’ve never tried lighting a greasy dough block, so I don’t know whether it needs help or not.