Instead of parchment, why not use a silicone baking mat?
Jan, I think silicone insulates the bottom crust of the pizza too much. I like it to get that fast, hot contact from the hot stone; parchment is a whisper-thin barrier, as opposed to silicone, and the heat blasts on through the parchment to the crust nicely. PJH
February 17, 2009 at 5:33pm