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We have this also in Singapore but the last one I had in Singapore wasn't half as good. I search google for: curry fish head recipe
Some interesting results came out.
This recipe looks interesting though lack of pictures:
http://www.food.com/recipe/singaporean-fish-head-curry-221783
Another more interesting is this youtube video. I went through it in double speed but the guy went quite detail.


Maybe you can cook one and make a post about how you do it. :-)