Heat oil in a pan.

Add mustard seeds. Stir over medium heat until they begin to splutter.

Add garlic and ginger and stir for a minute.

Add green chillies and stir lightly.

Add the onions and sautT until translucent and glossy.

Add turmeric powder and stir well.

Add fish and the third extract of coconut milk. Bring it to a boil.

Lower the heat and simmer, turning carefully once, for three minutes.

Add salt and stir well.

Add curry leaves, tomatoes and the second extract.

Cover and simmer for three minutes.

Remove the pan from heat and gently (make sure that the fillets do not break) stir-in the first extract of coconut milk.

Return the pan to heat and bring to a boil over low heat.

Sprinkle lemon juice and stir carefully.

Remove from heat and adjust the seasoning.

Transfer the contents to a bowl.

:- Serve with steamed rice.