Jin deui is a type of fried Chinese pastry made from glutinous rice flour. The pastry is coated with sesame seeds on the outside and is crisp and chewy. Inside the pastry is a large hollow, caused by the expansion of the dough. The hollow of the pastry is filled with a filling usually consisting of lotus paste (蓮蓉), or alternatively sweet black bean paste (dousha, 豆沙), or less commonly red bean paste (hong dousha, 紅豆沙).
Depending on the region and cultural area, jin deui are known as matuan (麻糰) in northern China, ma yuan (麻圆) in northeast China, and jen dai (珍袋) in Hainan. In American Chinese restaurants and pastry shops, they are known as Sesame Seed Balls.
The origins of jin deui can be traced back to the Tang dynasty as a palace food in Changan, known as ludeui (碌堆). This food item was also recalled in a poem by the Tang poet Wang Fanzhi. With the southward migration of many peoples from central China, the jin deui was brought along and hence became part of southern Chinese cuisine.