Combine millet with 2 cups of water and pressure cook on medium-low flame for 4~6 whistles. Millet can be cooked in a saucepan until all the water is absorbed and the millet is cooked thoroughly, this will take about 25~30 minutes. You might have to add more water.
In the meantime, ghee 2tsp ghee in a small pan and fry the nuts & raisins until golden. Remove from heat and set aside.
Once the pressure subsides on the cooker, open the lid and add the milk and ground cardamom. Simmer for 2~3 minutes. Add more milk if you like thinner Payasam.
Turn off the heat and add the sweeteners. Mix well, add the fried nuts and raisins; let sit for 5~10 minutes before serving.