Boil 1.5 litre full fat milk in a pot.
Add 2 tsp vinegar to it. Mix it well. Milk should start to curdle, if not add some more vinegar.
Strain it using a muslin cloth or cotton cloth. Add cold water to reduce the hotness.
Now squeeze the extra water from the cloth and leave the chenna to set for 20 minutes. It is better to keep it under heavy vessel.
Take out the chenna from the cloth after 20 minutes.
Mash the chenna into small pieces.
Now use the wrist side of your palm to press it and make it smooth. Do it for 5 minutes.
Add the corn flour to it and mix it well. Again knead the mixture for 5 more minutes.
Now take a small portion and roll it to make smooth balls. There should be no cracks. Prepare 14 balls and keep them aside.