Lansium domesticum.

Botanical name: 

Lansium domesticum Jack. Meliaceae.

A tree of eastern Asia, cultivated in China. Its fruit is sold in the Canton markets. The fruit is the size of a pigeon's egg, of a yellowish color without and whitish within. It is highly esteemed and is eaten fresh or variously prepared. It is known in the East Indies as lansa, langsat, lanseh, ayer-ayer or bejetlan. In, Borneo, Wallace calls it one of the most delicious of the subacid, tropical fruits.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.