I was looking for the hatkora but ended up getting this citrus fruit called JARA.
It is not really a lemon but more like a grapefruit with a lemon taste.
The rind is thick and hard which makes it hard to squeeze but extremely fragrant that people make candied rind from it.
If you hold the jara to your nose at the shop, you will get a strong lemongrass verbena smell.
There was also much bigger ones called JARA Sylheti.