Combine the sugar and milk with 3 cups of water in a large pan approx. 200 mm. (8") in diameter and 150 mm. (6") in height and heat while stirring continuously till the sugar dissolves.
When the syrup comes to a boil, the impurities in the sugar will begin to float on the surface, forming a grey layer.
Heat over a medium flame to allow the grey layer to float. Do not stir at this point as the layer will break and it will not clarify the syrup.
After about 5 minutes, slowly drizzle 1 cup of water form the sides of the pan with the help of a ladle. Water added at this stage will bring down the temperature of the sugar syrup and will not allow it to boil and break the grey layer.
Continue to simmer the syrup over a medium flame for about 10 minutes and then gently remove the grey layer using a slotted spoon.
Bring the syrup to the boil once again and then slowly drizzle another cup of water from the sides of the pan using a ladle. remove all the remaining impurities from the syrup, again using a slotted spoon.
Increase the flame and boil vigorously for 1 to 2 minutes. Keep aside.
Mix 2 teaspoons of the plain flour with 3/4 cup of water to make a flour solution. Keep aside.
Heat the sugar syrup in a deep pan over a high flame and allow it to boil vigorously.
When it boils, sprinkle half the flour solution in the sugar syrup and then add the chenna balls by upturning the plate on which they are kept. (Do not touch the chenna balls at this point as they are fragile).
When the flour solution is added, a frothy layer is formed on the surface of the syrup.
If the frothy layer begins to subside, sprinkle the remaining half portion of the flour solution.
After this, keep on sprinkling water (minimum 1 cup) on the surface of the sugar syurp. Ensure that the syrup froths all the time while cooking the rasgullas.
Cook for about 15 minutes, continuously sprinkling water to enable the froth to form.
Check if the rasgullas are cooked. This is determined by touch. If the rasgulla springs back and retains its shape when pressed, it is cooked. Another way of checking is to drop a rasgulla in a pan of cold water.
If it sinks to the bottom, it is cooked.
Remove form the fire.
Transfer the rasgullas to a bowl along with 2 ladles of sugar syrup and 1 cup of water.
Cool and chill for approx. 3 to 4 hours before serving.