Take the ingrediends for marination: green chillies, turmeric powder, black pepper, coriander leaves, curry leaves, a piece of kokum pod, salt and blend in a mixer to a fine mixture.
Marinate the karimeen with the above prepared marinade for a few minutes.
In coconut oil, shallow fry the karimeen to a golden brown color.
Take an earthen pot and add 2 tbsp coconut oil. Heat oil and add mustard seeds. When it splutters, add the roasted Karimeen pieces on the seasoning. Pour a cup of coconut milk into this. Add kanthari and ginger pieces and cook covered over medium heat.
Cook for about 10 minutes.
After 10 minutes, turn off the heat, add salt and serve in a flat pan.