Fry the Moong dal for 4 to 5 minutes until you see it nicely roasted and aroma comes out.
Wash the dal a couple of times and take it in a pressure cooker along with three times water and pressure cook for 3 whistles.
Once the pressure falls, add milk and cook in low flame till you get a creamy texture.
Meanwhile, melt the jaggery and cook for a couple of minutes to thicken. Sieve to remove impurities if any.
Add the jaggery to the simmering dal, when it thickens enough, add roasted cashews.
Add water/milk as required to get a thick consistency
Heat ghee in a small pan and roast the cashews.
Pour this over the simmering payasam.
Serve it hot