For the Nahm Jim sauce:
In a bowl add the lemon juice, fish sauce, sugar. Mix well to dissolve the sugar.
Now add the garlic, chillies, coriander ( do not gorget to add the coriander roots and they have a lot of flavor in them).
Add the kaffir leaves and water. Mix well.
For the fish:
Marinate fish fillet with fish sauce, chopped galangal, chopped lemon grass, kafir lime leaves for about 15-20 minutes)
Put them in a steamer till cooked.
Heat the Nahm Jim dressing with a bit of water till a slight boil (we do not have to reduce the sauce).
Pour over fish. Garnish with basil, kafir lime leaves or coriander leaves.
For the Chilli Oil Dressing:
Heat oil, add red chillies and pour over the fish and serve.
Tip: The Nahm Jim sauce can also be used as a dressing for a nice cold salad.