Originally Posted by Lurker

This is by no means beyond current technology... in fact I remember in my young years seeing a play called Hansel and Gretel. In this play, that obviously occured at least 100 years before the present, there was a wicked witch who only had to shout in a loud voice "oven heat" and the sound of her voice brought the oven to a temperature hot enough to "roast little girls and boys". So... I would assume that this oven works on the same basic principle...