Canarium pimela

About

Canarium pimela, also called Chinese black olive, is a species of tree in the family Burseraceae. It is found in Indo-China; in Vietnam it is called trám đen or cà na. In Thai, it's called 'Nam Liab (หนำเลี้ยบ)'. The Catalogue of Life does not record any sub-species. Once boiled in salt water the fruit are edible, resembling the flavor of salted plums, and are used in Chinese cuisine as a seasoning.

Summary from Wikipedia