I saw the episode. I thought it was a longan and he was just mistaken. He also seemed to think that sapodilla was a native fruit. Lol.

I just googled it and I was right. Kelengkeng is an Indonesian name for longan.

Here is a link that might be useful: Kelengkeng

Thanks for the information murahilin, now I wonder what variety it is. The fruit seemed to have a lot of flesh compared to the seed.