Take a deep bottomed utensil, add 2 cups water and boil the chopped sweet potato for 5 minutes or until they are soft.
After the sweet potato gets boiled, add sago pearls and let it cook for 2-3 minutes.
Now add coconut milk and grated jaggery and stir well till jaggery dissolves completely.
Let the coconut milk boil for 10 minutes on low flame.
Garnish with cardamom powder. Serve it hot or chilled.