Canarium album

Canarium album is a species of flowering plant in the family Burseraceae. This tree is native in Cambodia, China, Laos, and Vietnam. The Catalogue of Life does not record any sub-species.
Canarium album produces a fruit commonly called Chinese olive or white olive, though it has no relation to Olea; it is consumed in Vietnam, Thailand or kana ) and in China.
The pulp of the tree's fruit and its seeds are edible, with a strong resinous flavor when they are fresh. Culinary oil can be extracted from the seed. Preserves can be made with the fruit, both sweet like jam or pickled preserves. In China, a pickle called olive vegetable
, made from a mix of Canarium album fruit and mustard greens, is commonly used as a flavoring for congee and fried rice, with Teochew people specifically being very fond of the pickle.
Mostly cultivated in Thailand, cultivation has been introduced on a smaller scale to Fiji and northern Queensland in Australia. Its fruit, resin and seed are exported to Europe where they are used in the manufacture of varnish and soap.

Cultures

Teochew

When celebrating Chinese New Year, it is a custom for Teochew people to keep green olives in one of the compartments of a Chinese candy box. In CNY, olives are also called diêng1 guê2 or betel nuts. Though green olives may referred to as betel nuts in Teochew, they should not be confused with the betel nuts, fruits of the areca palm, consumed in Taiwan, Southeast Asia and Fujian. It was said that Teochew people used to have the practice of betel nut chewing like the people in the neighbouring regions. But by late Qing dynasty or early Republican period, they gave up on the addictive betel nuts and took up green olives as a substitute. From then on, eating olives, both green and black, become a custom in Teochew.