Marinate fish in salt and pepper, pan fry.
For the sauce:
2 pcs Coriander roots
4 garlic cloves
1/4 c shallots
Chili as desired
1 1/2tbsp tamarind paste
1 1/2 tbsp sugar
1 tbsp fish sauce
1/2 c chicken stock or water
Pound the 1st 4 ingredients, then stir fry in med heat, add in the next 4 ingredients, Cook until thick.. you can adjust sweet/sour/ salty accordingly
Garnish with fried shallots and coriander leaves