Don't use the 2x or 3x scaling buttons for this recipe. For how much rice to make for your sushi, see the Notes at the end.
How to Measure Rice: Overfill uncooked short-grain white rice in a rice cooker cup or a ¾ cup (180-ml) measuring cup and level it off. Pour the rice in a large bowl. Repeat until you have the amount you need. Nami's Tip: Use Japanese short-grain white rice. Long-grain, jasmine, and brown rice won't hold together, and the sushi falls apart.
Gather all the ingredients.
To Wash the Rice
Quick Rinse: Add just enough water to the bowl to submerge the rice, then pour it off immediately.Nami's Tip: Rice absorbs water quickly at first, so discard this water right away. This helps rinse off impurities and reduce absorption of the milky water.
Wash: Gently agitate the wet grains in a circular motion with your fingers for 10–15 seconds. Nami's Tip: Using very little water allows the grains to rub against each other and reduces the absorption of impurities.
Rinse: Add water to cover the grains and immediately discard the cloudy water. Repeat the wash and rinse two more times.
Drain Well: When the water is almost clear, drain the rice thoroughly in a fine-mesh sieve. Shake off any excess water.
To Soak and Cook the Rice
Put the well-drained rice in the rice cooker's inner pot and add the measured water. If your rice cooker has a Sushi Rice mode, fill to that line instead; on White Rice mode, fill to just under the line.Nami's Tip: Sushi rice uses 1 part rice to 1 part water, less than regular steamed rice, because the grains still have to absorb the sushi seasoning.
Wipe any dirt off the kombu with a damp cloth and lay it on top of the rice. Leave the white powder on the surface; it carries umami.Nami's Tip: Never rinse kombu. The flavor sits on that surface and washes away. Kombu is fairly clean these days, so you don't have to do anything.
Soak the rice and kombu for 20–30 minutes, then start cooking. A pot over the stove, an Instant Pot, or a donabe all work with the same amount of water.
To Make the Homemade Sushi Seasoning (Optional)
Skip this section if you're using bottled sushi seasoning (seasoned rice vinegar). Otherwise, combine the rice vinegar,sugar, and salt in a small saucepan.
Heat it over medium heat, whisking, until the sugar dissolves and it's nearly simmering. Remove from the heat and set aside.In the microwave, 1 minute is usually enough.
To Season the Rice
Moisten a wooden sushi oke(hangiri) with running water, drain, and dry it with a clean towel. A baking sheet moistened with water works too.Nami's Tip: This wooden tub helps absorb excess moisture, whereas a baking sheet does not.
When the rice is done cooking, discard the used kombu (or repurpose it to make Kombu Tsukudani (simmered kombu)).
Transfer the hot cooked rice to the sushi oke. Spread out the rice evenly with a rice paddle so it will cool faster.
While the rice is hot, pour the sushi seasoning over it. Nami's Tip: Sushi seasoning should be warm or room temperature. If you use a bottled seasoned rice vinegar from the fridge, warm to room temperature Seasoning straight from the fridge doesn't soak into hot rice evenly.
Don't stir the rice; stirring breaks the grains and turns it mushy. Instead, hold the rice paddle at a 45-degree angle and slice through the rice to spread the seasoning and separate the clumps, fanning it vigorously as you go.Nami's Tip: Fanning wicks away the excess moisture and makes the rice shine.
Gently flip a scoop of rice after every few slices.
Continue until the rice is barely warm, about body temperature. Your sushi rice is now ready to use in your favorite sushi recipes.
To Keep
Cover the sushi rice with a damp towel (or paper towel) and keep it at room temperature for up to a few hours. To store it longer, see below.
To Store
Freeze the leftovers in an airtight container for up to 1 month. To use, defrost it overnight in the fridge, then bring it back to room temperature in the microwave, warm but never hot.Nami's Tip: The refrigerator's cold air makes rice hard and dry, so I don't store it there. If you must, wrap the container in a thick kitchen towel so the rice stays cool without going cold.
Notes
What's the measurement for 1 rice cooker cup?
The plastic rice cooker cup that comes with the rice cooker is ¾ cup (180 ml). In Japan, this amount is called ichi go (一合).
One rice cooker cup of uncooked short-grain Japanese rice is 150 grams.
How much rice do you need to make?
1 rice cooker cup (= 180 ml = ¾ US cup = 150 g) of uncooked rice makes 2¼ US cups (330 g) of cooked rice.
1 thick sushi roll
2 medium sushi rolls
4 thin sushi rolls
3 inside-out rolls
2 rice cooker cups (= 360 ml = 1½ cups = 300 g) of uncooked rice make 4⅓ US cups (660 g) of cooked rice.
2 thick sushi rolls
4 medium sushi rolls
8 thin sushi rolls
6 inside-out sushi rolls
3 rice cooker cups (= 540 ml = 2¼ cups = 450 g) of uncooked rice make 6⅔ US cups (990 g) of cooked rice.
4 thick sushi rolls
6 medium sushi rolls
12 thin sushi rolls
9 inside-out sushi rolls
4 rice cooker cups (720 ml = 3 cups = 600 g) of uncooked rice make 8¾ US cups (1320 g) of cooked rice.
5 thick sushi rolls
8 medium sushi rolls
16 thin sushi rolls
12 inside-out sushi rolls
5 rice cooker cups (= 900 ml = 3¾ cups = 750 g) of uncooked rice make 11 US cups (1650 g) of cooked rice.
6 thick sushi rolls
11 medium sushi rolls
20 thin sushi rolls
15 inside-out sushi rolls
How much prepared sushi rice do you need for one sushi roll?
One thick sushi roll (Futomaki) requires 1⅔ US cups (250 g) of prepared sushi rice.
One medium sushi roll (Chumaki), like Vegetarian Sushi Roll, requires 1 US cup (150 g) of sushi rice.
One thin sushi roll (Hosomaki) requires ½ US cup (80 g) of sushi rice.
One inside-out sushi roll (Uramaki), like California Roll, requires ¾ US cup (110 g) of sushi rice.