I just tried mangosteen for the first time, and boy is it tasty! I think it’s expensive and hard to find in the US, but if you have a good opportunity to try mangosteen, take it!
Also, a cool thing happened when I was buying it. As the vendor was weighing out my mangosteen after speaking with me in perfectly understandable English, he switched to rapid-fire Chinese to advertise to some Chinese people passing by (language and ethnicity are my best guesses, not confirmed). I can only assume he speaks Malay as well. Kuala Lumpur is very multicultural!