So what will New York unleash on the rest of the country next? New York's definitely in the grips of a gourmet sandwich trend -- one of my favorite spots for a Vietnamese sandwich, Baoguette is pictured here). But that's already spread to other cities, so I say it doesn't count. No, I'll put my money on gourmet whoopie pies -- the blog Restaurant Girl recently picked out the city's best. (N.B., Magnolia Bakery, as guilty for the cupcake craze as any single entity, is selling a "whoopie cookie", a brown sugar cookie sandwich with maple cream cheese filling.) And after that? Grub Street, New York magazine's food blog, has officially deemed corn dogs a trend. If you're visiting New York, get your corn dog at The Shake Shack. Just check the webcam on the site to make sure the line isn't insane before you set out.