Pressure cook plantain for1 whistle with the skin.
After it cools, peel off the skin and grate it.
Heat oil in a pan. Add mustard seeds and when it splutters, add urad dal, red chilies, curry leaves and sauté for a few minutes until dal turns golden brown.
Then add finely chopped onions, green chilies, ginger, salt needed and sauté till onions turn transparent.
Keep the flame low, add the grated plantain and cook for 2 minutes. Check for salt.
Now add the grated coconut, mix well and switch off the flame.