I'm just about to try the Apple Lady's Apple Cake submitted by Wise One. For the set up, it says to put the pan on firebricks or a stone, doesn't mention indirect, so can the stone sit right on the grill? Seems like 400 might be a little high to do that, but I don't know. Also, I don't have a rectangular cast iron pan, so was going to do it in my rectangular steel pan. Anyone who's done this, please let me know if I can go direct. Thanks.