American classics collide with Korean flavors at this Ossington snack bar. It may sound confusing, but it works. The Loosey, a fresh take on the Pennsylvania sliced-bread hamburger, is a postmodern Big Mac pretender. It has the familiar crunch of iceberg, onion, and dill pickle, but the special sauce has been upgraded: a kimchi-zinged hollandaise that soaks into the thick-cut challah bread. The griddled patty (half fatty brisket, half lean rib eye) holds the precarious stack together, though eating it elegantly is near impossible. Luckily, between the dim lights and thumping bass, no one’s likely to notice. They’re too busy knocking back boozy cocktails to care.