Grind the coconut and green chillies very smooth and soft and set aside.
Place 4 teaspoons peanut oil in a small karahi and fry the curry leaves, ginger and mustard seeds till crisp.
Place the grated mango, chopped onions, coriander, ground coconut and green chillies in a bowl. Sprinkle fine salt and mix in the mustard seeds, curry leaves and peanut oil. Chill and serve.