This is not langsat nor duku nor dokong...
I dunno the name :( Thanks to Slurp for enlightening me with the name Buah Rambai & Selba for the name buah Menteng/Kepundung (in Indonesia)
Even the flesh resembles langsat. But the taste is totally different. The edible flesh is minimal, and it's sour, unlike the sweet langsat/duku/dokong. (when I say sour, it's really sour...)
Thick dark-orange skin with yellow flesh. The taste is unique - Sour with tinge of sweetness.
someone loves this. I prefer the nut/kernel than the flesh :P