Unlike most food trucks, which cook on propane, Darsky's oven burns almond and oak logs, at a sweltering 800ºF. "Part of cooking this kind of pizza is about building a really big flame," Darsky says. "It would be great to go from place to place with a raging fire. But that would be stupid and unsafe." Instead he lights the oven when he gets to his destination. Fortunately, the oven walls' 4.3 inches of fireproof brick retain heat for days, so Darsky can preheat the oven before he leaves. Then he extinguishes the flame, closes the oven up safely, and heads out on the road.