Add the green gram in a pressure cooker and add 1.5 cup water. Close the cooker and cook in high flame till first whistle and in low flame till 3 whistles.
Melt jaggery by adding 1 cup water and strain it.
Pour the coconut milk, powdered ragi and melted jaggery into a saucepan and mix well.
Finally add cooked green gram, salt and cardamom powder.