Keep yogurt culture on a coffee filter or cheesecloth for at least an hour to strain the water. This process is very important as this will make the yogurt thick in consistency.

On a medium heat, start caramelizing sugar. Stir continuously and keep a close eye so that it doesn't burn.

Once sugar is caramelized, turn off the heat and add half cup of milk. Dissolve the caramelized sugar properly.

Now add all the remaining milk and turn on the heat to medium and keep stirring intermittently.

Continue to boil the milk till it reduces the quantity to approximately ⅔rd.

Turn off the heat. Let the reduced milk and caramelized sugar mixture cool down till it becomes lukewarm.

Add strained yogurt spoon by spoon and whisk it well. Make sure it is evenly distributed in the warm caramelized milk mixture.

Now pour the yogurt milk mixture in desired containers and close them with aluminum foil. Let it set undisturbed in a warm , dark place for 8-10 hours. Perfect texture, thick and rich Mishti Doi will be ready. Enjoy !

If using Instant Pot : Follow all the steps as above until the last step. Start the yogurt function on Instant Pot. Add a cup of water and set the trivet in the main insert. Keep the milk with yogurt culture containers on the trivet and close the lid. Perfect texture, thick and rich Mishti Doi will be ready in 8 hrs. Enjoy !