Jian dui | 
| Alternative names | Matuan, mayuan, zhendai, buchi, onde-onde, sesame ball, sesame seed ball, | 
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| Course | Tea, snack | 
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| Place of origin | Chang'an (now Xi'an), Tang dynasty (China) | 
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| Region or state | East Asia | 
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| Main ingredients | Glutinous rice flour, sesame seeds, various fillings (lotus seed, black bean, red bean, mung bean pastes) | 
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Jiandui or sesame balls are 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 after immediately being cooked. 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.
Depending on the region and cultural area, jiandui are known as matuan (麻糰) in North and Northwest China, mayuan (麻圆) in Northeast China, and zhendai (珍袋) in Hainan.