i'd say go to Farrer Park at Little India for Muthu's Curry but i
don't know how bad it has become.. in the past it was pretty
good..
but Little India is a good bet.. can bring the fella to Mustafa
too..
i think the Dempsey Road place has pretty good fish head curry..
i've not had it but i've heard about it...
either that or go to Beach Road.. sup tulang 
Muthu's Curry is for tourists la
Dempsey Road is nice. Lots of chill out places after dinner
too