Take fish cubes in a
bowl, add 1 tbsp lemon juice, salt and 1 tsp ginger-garlic paste and mix well and set aside in the refrigerator to marinate for 2 hours.
Heat oil in a non-stick
wok, add mustard seeds and curry leaves and saute till the seeds splutter.
Add onions and green
chillies and saute till onions turn a light brown.
Add remaining
ginger-garlic paste, turmeric powder, salt, coconut milk and a little water and mix well.
Add fish and let it
cook in the gravy till done.
Add coriander leaves
and remaining lemon juice and mix gently so that the fish cubes do not break.
Transfer into a serving
bowl, garnish with coriander leaves and serve hot with boiled rice.