1. Rice preparation:
2. Rinse the rice with cold water until the water runs clear. Let it drain.
3. Cook the rice in 15 cl of water: bring to a boil for 2 minutes and let it simmer for 10 minutes covered on low heat. Let it cool.
4. Boil the rice vinegar with sugar and salt. Let it cool. Mix the seasoning with the rice.
5. Roll preparation:
6. Slice the cucumber and avocado into thin, long strips.
7. Spread 1 cm of rice on each sheet of nori.
8. Sprinkle with sesame seeds.
9. Flip the nori sheet (so that the rice ends up on the outside of the roll) and spread a little wasabi.
10. Fill with cucumber, avocado, and crab, then roll to form the roll (easier if you have a makisu: a bamboo rolling mat).
11. Cut each roll into 8 pieces.