Grind the coconut to a paste along with cummin seeds and green chillies.
Add a little water to gram flour and make paste.
Heat oil in a pan and saute the paste, ginger, turmeric powder, mango cubes and mango juice.
Add the gramflour paste to thicken the gravy.
Bring to a boil then add curry leaves, salt and the jaggery.
Mix well, remove from heat and serve hot.