Wash and soak the rice and chana dal for 20 mins. Change water and add 1.5 cups water and pressure cook for 3 whistles. Let the pressure fall down.
In another pan, take the jaggery and 1/2 water, melt. Remove the impurities and cook for another 5 to 6 mins, till the jaggery becomes a little thick syrup.
Slowly add this thick syrup to the cooked rice and combine well. Make sure the jaggery gets mixed well and there are no lumps.
If required, add 1/2 cup more water. Add the cardamom and pressure cook for another whistle. Let the pressure fall down, remove the lid, mix the rice with jaggery well.
After 5 to 6 mins, heat another pan with ghee, when hot add the cashews and pour this the pongal. Combine everything well.
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