Peel and cut ash plantains into 1 1/2" lengths. Heat a pan and roast the curry powders until dark brown and set aside.
Then heat the oil in a pan and add curry leaves and chopped onions. Fry until the onions are light brown. Now add the ash plantains mixed
with all the ingredients and toss for a few minutes. Finally add coconut milk and bring to boil. Cook until gravy has reduced and plantains are cooked.