Zelazny's Arcane Campfire

You conjure a real campfire at a fixed point on the ground within range. It produces genuine heat and light exactly as a mundane campfire would, and food can be cooked over it normally. As an action, you can adjust its size and intensity anywhere from a small ember to a proper bonfire. It can be extinguished by any means that would put out a mundane fire of its current size, ending the spell. You can also dismiss it at any time with no action required.