Mystery fruit, Bangkok, Thailand Chakrabongse Road Banglamphu Market
This is Sandoricum koetjape, commonly called Santol or also known as Dragonfruit. It’s actually a thai dessert that’s made from the Santol fruit, called Santol compote.
The pulp is eaten raw and plain or with spices added. It is also cooked and candied or made into marmalade. Grated rind is cooked in coconut milk (with bits of pork and hot pepper) and served as a dish in Bicol, Philippines. In Thai cuisine this fruit is used to make som tam when still not fully ripe. It is also one of the main ingredients in the santol and pork and santol and prawn Thai curries.
But be aware of the seeds. Doctors in Thailand and the Philippines have warned about the risk of intestinal obstruction and perforation from swallowing the whole seeds of Sandoricum koetjape.