Add moong dal and rice. Roast on low flame for a min. Do not brown them. Roast till fragrant.
Add 5 cups of water to the cooker. Close the lid and pressure cook for 5 - 6 whistles. Let the pressure release naturally
Mash the rice and dal mixture with the back of the ladle.
Meanwhile, in another pan, add powdered jaggery and 1 cup water to immerse it.
Heat till the jaggery dissolves. Filter the jaggery syrup.
Now add the jaggery syrup to the pressure cooker.
Mix well. Let it cook for 3 more mins.
Add ghee now and then.
In a pan, add ghee
Add cashews and raisins. Fry till cashews turn golden brown and raisins puff up.
Add it to the pressure cooker. Add cardamom powder and give a good mix.
Switch off the flame at your desired consistency.
Notes
Pongal tends to become thick after it cools down. If it is too thick, you can add hot water and keep on medium flame for 2 mins to adjust the consistency.