Cook the three types of rice in three separate pots. Let them cool slightly before step 2.
Lay a 10-inch x10-inch sheet of plastic wrap on a flat surface. Spread half of the white rice on top of the sheet.
Add one-third of the seaweed paste mixture onto the middle of the rice, then top it with one-third of the sesame seaweed mix. Spread the remaining half cup of white rice on top of the mixture, and gently even it out with your palm.
Carefully raise the edges of the plastic and place your hands underneath it. Shape the ingredients tightly together into a ball, then remove the plastic wrap.
Repeat the steps above using the brown and red or black rice to make two more balls.
Arrange the three colors of rice balls on a serving dish. Serve cold.
Notes
Note: To make six medium balls or nine small balls, reduce the amount of rice and filling you use in the first and second steps by one-half, or two-thirds.Tip: Rice balls are easier to make with warm rice.*Seaweed paste can be store bought, or made at home from a recipe found online such as the one here: tinyurl.com/43mtzehn