* Hold a marshmallow over the firepit. "This is a dragon marshmallow. Who's a good dragon? Who wants a marshmallow? Here you go!" Throw it in.
* Put some marshmallows on roasting sticks. "These are human marshmallows. Don't eat them. If you leave these alone, you'll get another marshmallow later."
* Later: "Good dragon! Have another marshmallow!"
Total number of marshmallows accidentally dropped or set on fire: 0
Operant conditioning for fire elementals.
Who says you can't mix science and magic?