Rinse the rice under cold water, gently swishing it around with your hand. Drain the water and repeat this process 4-5 times until the water runs clear. This removes excess starch and prevents the rice from becoming too sticky.
After rinsing, let the rice soak in cold water for about 30 minutes. This helps the rice grains to absorb water evenly and cook more uniformly.
Drain the soaking water and transfer the rice to a rice cooker. Add 1 1/4 cups of water.
If you don’t have a rice cooker, you can cook the rice in a pot. Combine the rice and water in a heavy-bottomed pot with a tight-fitting lid. Bring it to a boil over medium-high heat.
Once it boils, reduce the heat to low, cover, and simmer for 18-20 minutes. Avoid lifting the lid during this time.
After the cooking time, turn off the heat and let the rice sit, covered, for another 10 minutes to finish steaming.
Transfer the cooked rice to a large, non-metallic bowl (wooden or plastic is ideal).
Add the rice vinegar, sugar, salt, black sesame seeds, teriyaki sauce to the rice.
Spread the seasoned rice out in the bowl to help it cool quickly. You can use a fan to speed up the cooling process. This helps give the rice a shiny appearance and improves its texture.
Once the rice is at room temperature, it’s ready to use for making sushi.