They are really, really good. I had no idea they were a NY thing, though.
We get them where I live, but I've always associated them with NYC. I don't know how popular they are.
In Lancaster whoopie pies (Two small discs of a spongey chocolate cake with whipped cream between them) are popular and I've heard some of the locals refer to them as a black and white. I'm not a huge fan of the whoopie pies.
