Dukong (Longkong) is a hybrid of Duku and Langsat with very few seeds.
It has a translucent, sweet & juicy flesh.
It usually comes into season just after Durian season.
In Peninsular Malaysia, its mainly planted in Kelantan, Terengganu, Pahang, Johor & Kedah.
Comparison between Dukong (Longkong) with Duku & Langsat :
Langsat fruit are ovoid, roughly 30 to 60 mm (1.2 to 2.4in) in diameter, while duku are rounder and 40 to 50
mm (1.6 to 2 in) in diameter. Longkong is intermediate, nearly seedless, with a brittle skin, and is the same
size as langsat. Skin of the young fruit of all types is pale green and turns yellow when ripe, frequently with brown blemishes. The langsat has a thin skin that contains a milky white sticky sap. Duku has a thicker skin (up to 6 mm; 0.25 in) and no latex. Longkong has a slightly thicker skin than langsat and less sap that is not sticky