Been a long time since I was involved in Scouting. In those days we made stoves based on two #10 cans, and burned wood in them. Combined them, sometimes, with smaller cans for nesting cookware.
The bottom can was the fire box. Top can rested open-end down on it. In theory you could bake a biscuit inside the top can while you fried an egg on the surface.
Of course, as the poet never said, in theory, theory and reality are the same. In reality they're not, and it never worked out quite that way.
But then again, if it wasn't burned on the outside and raw on the inside how would you know you were camping.
Ah, well. Those were the days indeed.