Heat oil in a pan ,add pearl onions,ginger and green chillies and saute it.
To the mix add turmeric powder,chilly powder and desired salt and saute well.
Add chopped tomato,then add the sliced raw bananas and cook it in a cooker for 1 whistle other wise you can cook it under lid for some time.
Heat coconut oil in another pan,add grated coconut and fry it well,also add peppers.
When turned brownish, add coriander powder,chilly powder, don't overcook it.Take out off flame.
Allow it to cool and when cooled grind it well.Do not add water while grinding.
Add this to the cooked raw bananas and make it to boil.
Allow to cool and after this add thick coconut milk to it.
For seasoning,heat oil in a pan, blast mustard seeds along with dry chillies, curry leaves and coconut pieces,if you want more taste add little of chicken masala powder,this is optional.
Serve Hot.