Alright - so here's the answer. It's #NolenGur which is syrup from the date palm - the winter specialty in Bengal, #Kolkata
It's not date syrup like dibbis, but the sap thickened as in maple syrup. This is boiled down to solid as in jaggery (the brown discs). Palmyra palm sap is similarly made into jaggery (a lot more in Thailand).

It's sold in sweet shops in jars, see👇🏽 , but better stuff in the clay pots from villages that produce

#DasEatsKolkata22

https://mastodon.online/@SRDas/109505680961149786

There are all kinds of other 'new' or seasonal treats - like this baked #sandesh (with #NolenGur of course) - [pic1] and the famed 'Joynogor-er moa' (moa from Joynagar; made with a special khoi or popped/puffed rice and shaped into balls) [pic2]
Tried the first but skipped the 2nd (those I find rather sweet)

Here's the wiki entry for Joynagarer Moa with info on nolen gur if you are interested
https://en.wikipedia.org/wiki/Jaynagarer_Moa

Bought a couple of other specialties - more on those at lunch...

And the winter specialty in #Kolkata and #Bengal is date palm syrup (not date syrup, but the sap - as in maple syrup) and the boiled down sugar/jaggery from that used to sweeten. You can buy the #NolenGur or #JholaGur (liquid) in jars and the blocks/discs of patali gur or jaggery (pic1).
Winter brings gur sweetened #sandesh
- sweets made with sweetened chenna - fresh soft cheese - compressed and shaped in traditional conch and palm fruit shapes set out in trays (pics 2-4)

but the best (next)

And the winter specialty in #Kolkata and #Bengal is date palm syrup (not date syrup, but the sap - as in maple syrup) and the boiled down sugar/jaggery from that used to sweeten. You can buy the #NolenGur or #JholaGur (liquid) in jars and the blocks/discs of patali gur or jaggery (pic1).