Take Channa dal and soak in water for few hours and later grind it to a coarse paste. Heat oil in a pan and when the oil gets hot, add mustard seeds. When the mustard seeds start crackling, add pinch of hing, turmeric, curry leaves and crushed green chillies. Add 1 cup coarsely ground channa dal and mix well. Add salt, pinch of sugar and mix well. Add grated raw mango and fresh coconut grated and mix all the ingredients well. As soon as you add grated mango and coconut, switch off the flame and sauté well. Sprinkle finely chopped coriander leaves.