This is more like a Thai style "siu chao". The stall is in front of Restoran Double Seven in Taman Sri Bintang.
Sambal petai. RM6.00 including rice.
Well, this is not really sambal petai. Real sambal petai should look something like this. Not much petai in it. But hey, it's only RM6.00 so I can't complain much.
Thai style "siu chau". You can view a bigger image here to see the details in the menu.
For address, location and gps coordinate, kindly refer to this post.