Load it
Hold the stick in one hand and thrust its point into food held in the other, or lying on the ground. Each new piece slides the others down the shaft.
Roast it
Hold it over a burning Campfire. Closer cooks faster, and too long burns it. A burnt piece crumbles to ash. It is only a stick: on a tree it chips no better than a fist.
Take food off
Close your free hand on a piece and pull it toward the tip. Roasted food fills you much more than raw, so it is worth the wait.