This fruit named Tin, some people call as heaven fruit, it because the fruit mentioned in Alqur'an as well as Olive fruit.
The benefits of Tin fruit can see in this link
http://www.cantikitu.com/2015/07/31-manfaat-buah-tin-si-buah-dari-surga.html?m=1
Today phenomenon is many people selling the seed and plant it in around their house, including my family !
My brother said quiet easy plant tin .
How about the taste ? The texture is soft, sweet if already ripe, rather plain if still half ripe. For me the taste almost like sawo.
if you open in the centre you will see like seeds, but its not, you can eat that. Some people suggest don't peel the skin, just wash and eat it !
I just eat it today, here is the look
That's a liitle bit info about Tin Fruit.
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Thank you !