I spent a few hours looking for the sort of camping stove you might take on a fishing trip. I remember a boys programme on the ITV in the
1960's with a chap called Jack Hargreaves.He had a small smoker that was just big enough to cook a small trout with a few chips of oak. All the stuff on the 'Net seem to require meths or gas trivet to roast the sawdust.
Such is progress.
How would I make a small wood burning one if the sawdust couldn't be convinced to do the job directly? Something about the size of a half gallon can would be a very large version of what I think I remember.