Fill a bowl with room temperature water and a small dish with salt. Keep these nearby to use as needed.
Using your spatula, divide the cooked rice into three equal sections in your bowl or pan.
Dip both of your (immaculately clean) hands into your bowl of water. Shake off the excess water.
Using your hands or spatula, scoop up enough rice to make one onigiri.
First, like making a snowball in two hands, gently form the rice into a sphere. Make it a ball shape but not too compact.
Place the sphere of rice in the palm of your non-dominant hand. Bend your palm to make a v-shaped "valley".
Bend the fingers of your other hand to make an upside-down v-shape. Cover the rice ball with your V-shaped dominant hand. Your dominant hand makes a "mountain" to cover the rice— think Mt. Fuji.
Then, gently squeeze the rice ball with your top v-shaped hand to form one corner of a triangle.
Next, flip the rice ball 90 degrees towards you. The first corner of your triangle should now be resting on the palm of your bottom hand.
Again, gently squeeze with your top, v-shaped hand to form another corner to make a triangle.
Repeat this rotate and squeezing process until you've made a neat triangle shape.