Cook the rice ada in water until soft, then drain and rinse.
Melt the jaggery with a little water and strain to remove impurities.
Add the cooked ada and jaggery syrup to a pan and simmer for 5–7 minutes.
Add thin coconut milk and cook gently for a few minutes.
Stir in thick coconut milk and cardamom powder. Heat gently without boiling and serve warm or chilled.