Soak gobindobhog rice in water for 30 minutes and then discard the water. Spread the rice over a clean cloth and let it dry.
Put the milk on a boil and then reduce it while stirring continuously over low heat.
You have to stir continuously while removing the skin from the sides. For the perfect payesh texture, you cannot allow the skin to form.
When the milk has reduced to almost half (about 2/3 and a little more), add the rice. Again, keep cooking and stirring continuously.
It doesn't take long for gobindobhog rice to cook and more importantly, we want an 'al dente' texture of the rice.
The rice needs to cook but not all through, not mushy. The minute the rice has reached the desired texture, add a tsp of sugar to stop the cooking of the rice any further.
You will see that as it continues cooking, the milk will loosen up a bit more since sugar melts and when the payesh starts boiling in a manner where small bubbles are bursting out, take it off the heat and add nolen gur to taste.
You cannot add nolen gur while it is cooking because there are chances of the milk splitting due to impurities in gur.`
As it cools down, the milk thickens and the payesh gets the right consistency
Refrigerate it and serve it chilled.