I typed this as comments at my pool of photos at Flickr:
Mangosteen is a seasonal fruit found in Malaysia. It has thick, dark purple skin and white flesh. The flesh is sweetish and slightly sourish. Careful when eating because the thick skin has sap which will leave a permanent brown colour on clothes and supervise children when eating. The seed is a choking hazard.
To Malaysians, I suppose manggis needs no further intro. The local manggis is not available yet. This is from Thailand, bought and devoured yesterday. About 50 sen per fruit at the moment.
I suppose everyone also knows the old saying, after eating durians, eat manggis to ‘cool’ the heat from the durians.