You can use pressure cooker for this but no need to use the whistle just close the lid and keep it in low flame.
I have used moderate sugar but you can increase but I feel it will be overpowering.
The ratio of sugar and water differs but for me this ratio works best.
Use only cows milk no buffalo milk .
If we knead the panner too much the oil from it will be out and the outcome will not be soft and spongy.
You can make small or big balls as per your wish.
For me the sugar used was clear did not form any scum but if yours has to be cleared pour some milk when boiling.
Foam will form on the top and you can remove it.