by Spider » Wed Oct 24, 2012 12:51 pm
Ya, mostly. The holes are formed by air channels as bubbles expand and steam gets blasted to the surface. Also, its the moisture content of the dough. A really slack dough is softer and easier for the steam to puff up. Plus, you're giving off like twice as much moisture. My ciabatta dough is more like batter than dough. It damn near pours.
What helps more than anything is to get a stone (I use a granite counter sink cutout) or cast iron or something. Something dense that can soak up a lot of heat, and quickly transfer it into the dough. Its why those old brick and clay ovens kicked so much ass.
Commercial ovens are nice...they go up to like 700 degrees, and some of them actually have a button you can push to blast the bread with steam. Maximizes oven spring.