Joynagar er Moa is a famous but rustic sweet of Bengal. Made from khoi , kheer and nolen gur, it is only a winter treat made in the small town of Joynagar about 50 kms from Kolkata. My father sent me these pictures from the local sweet shops in Kolkata which also sell this sweet during winter.
As a child I however remember hawkers from the village, going from home to home, selling this delicacy. They would come on bicycles, loaded with plain white paper boxes tied with yellow or blue strings,the boxes labeled as "Joynagar er Moa" in Bengali scripts. Some of those sellers were authentic, some not. Mother would know. Those plump round balls with raisin at the center and rounds of patali gur were the treats we looked forward to every winter.
Here is a good article on how they are made.
I had last tasted a joynagar er moa a decade back. This time my Father found someone who was traveling to US and is sending some for us. I cannot wait for tomorrow, for those soft sweet moas.