In a blender take all the ingredients or marination and blend to make a fine paste. Now apply this paste to fish fillets and keep aside for 30 minutes.
In a pan put butter and put the fish fillets gently to cook on slow flame. Add all the spices and mix carefully into the fish.
Once the fish is half cooked add the lemon juice, apple cider vinegar and fresh stock. Simmer the flame and cook for another 10 minutes. Serve hot.