This is a very cool idea. Hot, actually. All of the artisan bread baking gurus (a Google search of that term returns 9,860,000 hits) tell home bakers how to create steam in their domestic ovens – spray bottles so that you can spritz water against the wall (yeah, hit the 500 degree element and see what that does!), heating a cast iron frying pan then tossing in ice cubes (see the oven rack burn marks on my hands?), using a roasting pan filled with water (the steam scalds as it billows up into your face and you – I – drop the damned dough on the oven door). This one is much, much better. Lava rocks, heated in the oven, then doused with water…

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