Black and White cookies

There's been a lot of <a href="http://lthforum.com/bb/viewtopic.php?t=4266&start=0&postdays=0&postorder=asc&highlight=">on-line discussion</a>in Chicago about whether you can get a real New York style black & white cookie anywhere in Chicago. Here Gloria demonstrates the real thing, bought at Mother's Bakery in Riverdale.