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How to make onigiri 
Follow the directions for cooking the rice. 
Note it should be japanese-style rice so it sticks together easily. However, you might want to leave the rice in the pot for about 20 to 30 minutes before turning the rice cooker or pot on, so that the rice can become sticky.
Let the rice stand for a few minutes to cool down. As you're waiting, make your fillings (if applicable, as this is optional).