Traditional black and white cookies, spotted in bakeries and cafes all over New York City and Long Island, are things of beauty. Soft, cake-like vanilla cookies, topped with equal parts vanilla and chocolate frosting, the treats are simple and satisfying. So what if you have a hankering for the dessert long after your trip to New York has ended? We devised this recipe after tasting our fair share of these suckers, so anybody could recreate the cookies at home. They do take a fair amount of time, since you’re making two batches of icing and a light, fluffy batter. But you can bet they’re worth it.