As bright and colorful as penny candy, this visually arresting production of Engelbert Humperdinck's "Hansel und Gretel" puts a twist on the classic fairy tale upon which it's based by uprooting the action to modern times. Director Laurent Pelly's interpretation, which premiered at Glyndebourne in 2008, finds Hansel, Gretel and their family taking shelter in a cardboard box while the witch's stock of goodies lines the shelves of a supermarket.