Boil the plaintains(see that they are not over boiled) with slat.
Peel the plaintains and grate them finely.
Sprinkle a bit of salt if required and mix lightly with fingers carefully without smashing.
In a kadai, add oil. Add mustard and wait until it splitters. Then add urad dal and curry leaves.
Fry the urad dal till slightly brown. Then add Finely chopped onions and slit green chillies and fry until transperent. Finally add the grated plaintain and keep stiring for 2-3 minutes (not more than that). Then remove kadai from flame and then add grated coconut and mix well.
Serve hot as a side dish garnished with corriander leaves.