After seeing photos of this out-of-control sandwich that have inundated Instagram feeds recently, I had to go to the source, The Bagel Store in Brooklyn, New York. As I took the subway over the Williamsburg Bridge, I looked out over the East River and wondered if it would taste the way that I imagined: like a unicorn that swallowed a princess that swallowed a rainbow that swallowed a castle. You get the picture.