Jiandui 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, or alternatively sweet black bean paste, or red bean paste. They are also sometimes referred to as sesame balls .
Depending on the region and cultural area, jian dui is known as matuan (麻糰) in northern China, ma yuan (麻圆) in northeast China, and zhen dai (珍袋) in Hainan.