Take 2 tbsp of water in a heavy bottomed pan. It will help the milk in not sticking to the bottom.
Add milk and let milk boil.
Keep stirring at intervals so that cream/malai shouldn't form on the surface of milk.
When milk boils, switch off the heat and let milk cool down a bit for 5 minutes.
Take a ladle full of milk and add 1 tbsp of vinegar water in it.
Stir the ladle in the milk.
Keep on repeating the process until milk curdles and greenish water is seen.
Sieve the curdled milk through a sieve lined with muslin cloth so that milk solids (chenna) gets collected in the cloth.
Pour some water over the chenna so that smell and taste of vinegar washes away.
Squeeze the cloth so that excess water is released.
Place the chenna carrying cloth in a towel and keep aside for 1 hour so that towel will soak all the remaining moisture from chenna.
Put the chena in a wide tray or place.
Mash it for 5-7 minutes with the upper side of your palm. But do not over do it.
Lastly mix corn flour in the chenna and collect the chenna into a dough.
Make equal sized balls with no cracks.
In the meantime, add sugar and water in a pan alongwith kewra essence.
Let the water come to rolling boil.
Add all the balls in the sugar water.
Cover and let it cook for 15 minutes on high heat so that rolling of water shouldn't come down.
Just for once or twice, remove the lid and pour boiling water over balls without touching them.
While you are close to 15 minutes, take ice cubes and water in a bowl.
Without switching off the heat, keep on picking all balls one by one and dropping them in ice cold water.
Place the bowl carrying balls in refrigerator for 2 hours.
Also when cooled down, place the sugar syrup in refrigerator for chilling.
After 2 hours, gentle squeeze the balls one by one from water and transfer them to the chilled sugar syrup.
Enjoy