1. 1
Cut slices of fish about half a centimeter thick, then cut them in half lengthwise.
2. Moisten your fingers in the water/vinegar mixture and spread about 75g of rice on half a sheet of nori, leaving a 2cm strip on the far edge.
3. Place a line of wasabi in the center and across the width of the rice. Place your slices of fish along the wasabi.
4. While holding the filling, gently roll the mat between your index fingers and thumbs. Roll the mat until the edges of the seaweed touch and apply light, even pressure to the entire roll.
5. To finish
Unroll the mat. Moisten the blade of a wide knife and cut the roll in half, then each half of the roll into three pieces.