Sugar Hill Creamery has three locations in Harlem. Ice cream season is officially here. Happily, Upper Manhattan has become a great place to find some truly memorable frozen desserts. It's home to a number of shops specializing in small-batch ice cream and gelato as well as a stylish spots where you can pull up to the counter for thick shakes and more. Here, then, are TCU's favorites, from south to north. Sugar Hill Creamery • East Harlem 1642 Lexington Ave between 103rd and