After searching for a couple of years for a recipe for the chocolate version of this cookie I found one and was so excited that I made some the very next day. I took pictures as I may not make them again. They took longer to make than most cookies and there were a lot of dirty dishes to wash. But they were delicious and very close to the ones I remember eating in New York.
Also, I really should rename my blog as the original name is half moon-not black and white cookie.