The Pulasan or also known scientifically as Nephelium mutabile Blume, is a fruit from the rambutan genus. It is as small as an ordinary rambutan fruit. It's skin (exocarp) is dark red and hard. Instead of having "hairs" like the rambutan fruit, it's skin has blunt thorns. After opening it, the white jelly-like flesh (mesocarp) looks like that of a rambutan and is also edible. The inner part of it's exocarp is bright red as you can see. It taste almost like a rambutan except sweeter with a little sour taste.
According to Wikipedia, the trees thrive only in very humid regions between 360 and 1,150 ft (110-350 in) of altitude.
I took this picture in my home but the map location I put is in the stall where I purchased the fruit. I bought it because I have never seen any fruit like it before. It's prize isn't so expensive so I bought a bunch of it. The famous Kundasang row of wooden stalls ( http://farm2.static.flickr.com/1256/1182... ) where I bought the fruit is a tourist spot, there are all kinds of fruits on display there. The pulasan might be a seasonal fruit. I have never seen or heard the Pulasan before elsewhere in Sabah so it might be endemic only in the Kundasang highland area. I have one advice for those who are inexperienced in eating it, keep your fingernails short because under your fingernails will get stained by the reddish juice from it's exocarp. >>>Map accuracy : 100m radius.