Step 1: Cook the Sushi Rice: Wash and rinse the rice with cold water. Add the rice and water to the rice cooker. Cook according to the instruction.
Step 2: Season the Rice: Transfer the rice to a large bowl and let it cool down slightly. When it’s still very warm, stir in the sushi vinegar.
Step 3: Prepare the Topping: If you use raw fish, cut it against the grain, with an angle of 30 to 45 degrees. I recommend cutting it to 3-inch long, 1-inch wide, and 1/4-inch thick pieces.
Step 4: Shape the Rice: Place about 3 tablespoons of rice in your hand. Squeeze it together until it rolls into a firm oval shape. Make the bottom flat with the rounded top.
Step 5: Assemble the Nigiri: Place the fish, egg, or veggie slice on the root of your fingers. Then take a pea-sized portion of wasabi, and spread it in the middle of the slice. Place the rolled sushi rice onto the topping slice, and bend your fingers to cover both the topping and rice together. Press down the rice using the index finger from the other hand. Turn the topping and rice and let the topping slice sit on top of the rice.