To make rice balls you need glutinous rice. You can not need to put vinegar. Specific method:

Materials that need to be prepared in advance include: glutinous rice, sesame seeds, sugar, lard, oil sticks.

1, glutinous rice to be soaked in advance for more than two hours, the pot of water, lay a clean gauze poured into the soaked glutinous rice, steamed for about fifteen minutes.

2, the cooked black sesame seeds and fine sugar mix.

3, in the plastic wrap on the steamed glutinous rice, spread evenly, hot smear a small spoon lard.

4: Spread black sesame seeds and sugar evenly, and put two pieces of fritters on top.

5: Hold tightly to shape.