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1
Sumeshi: Rinse the rice thoroughly to drain some of the gluten from the rice.
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2
Cook the rice, using equal parts rice and water. I use a rice cooker, but you can also cook it on the stove if you don't have a rice cooker.
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3
Put the rice vinegar and sugar in a small pot over medium heat.
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4
Stir until the sugar has melted into the rice vinegar.
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5
Once the rice is finished cooking, take the rice out of the pot and put it in the hangiri (japanese wooden bowl), or a large bowl if you don't have a hangiri.
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6
Cool the rice and rice vinegar mix, then slowly pour the rice vinegar mix over the rice, using a cutting motion to mix it into the rice with the rice paddle (or wooden spoon). Keep a little leftover to use in the sushi preparation.
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7
To Prepare the sushi: Drain your tuna and mix all of the tuna salad ingredients together.
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8
Now take one piece of nori and place it on your sushi roller (recommended for getting tight rolls but in a fix you could use a stiff towel). Wet your fingers with the cooled rice vinegar mixture and press a fairly thin sheet of rice onto the bottom 3/4 of the sheet, leaving room at the top of your roll to seal it.
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9
Using a spoon, place a generous line of tuna a little lower than the half way point on your rice square. Then add a line of your lettuce leaves on top of the tuna.
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10
Begin rolling from the bottom, tucking firmly with each roll to tighten it. Be careful not to smoosh it though, it's a delicate balance but you'll get the hang of it after awhile.
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11
Once you've gotten to the blank top of your roll take a little of the rice vinegar mixture and apply it to the inside, roll it up and use a little more on the closed roll if it's not fully sealed.
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12
Using a sharp, wet knife cut into bite sized pieces. You can serve this with the traditional wasabi-soy sauce mixture but it's so flavorful it's not necessary.