If lwunderlich said that in Yorkshire they'd say, "You're not from round here are you". Not a question, just a statement. Popover and Yorkshire pudding batters are similar but the Yorkshire one is simpler, eggs, flour and liquid plus seasoning, and the best recipe I've found is from Delia Smith, you'll find it at http://www.deliaonline.com/recipes/r_0000000745.asp
. Not sure about the kind of roasting pan as I always use metal, but I suppose corningware would work, but you'd have to make sure it was very hot to start with.