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Toyota builds experimental hydrogen-powered pizza oven and grill.
(www.autoblog.com)
This is a most excellent place for technology news and articles.
Steam may be okay for the wheat crust, generally when baking bread steam is applied in the initial rise period, but is generally turned off at the end for a dry final bake. The cheese is another matter. Ideally the cheese has to do more than melt, it should develop a partly caramelized appearance on the top (slightly brownish in places). Whether that would happen with this kind of oven is unknown.