an oven has a first conveyor , a first burner that directs heat toward the first conveyor from above the first conveyor , and a second burner directs heat toward the first conveyor from below the first conveyor . a method includes providing foodstuff on a conveyor , exposing the foodstuff to heat directed toward the foodstuff from above the conveyor , and exposing the foodstuff to heat directed toward the foodstuff from below the conveyor . another oven has a first conveyor and first conveyor insulators that surround the first conveyor and define a first zone . another method includes introducing foodstuff to a first conveyor belt within a first insulated zone , introducing heat into the first insulated zone , and retaining a portion of the heat within the first insulated zone . another oven has an insulated cooking zone that closely envelopes a cooking path and an insulated oven zone that substantially envelopes the cooking zone .