Cook the sushi rice according to the instructions on the packet. Then pour the rice vinegar over it. Refrigerate.
Cut all other ingredients into small pieces and set aside.
To serve, fill four bowls with the rice. Spread the remaining ingredients on the rice and sprinkle with toasted sesame seeds.
Serve with soy sauce and wasabi paste.
This goes well with pickled ginger and freshly chopped coriander to taste. If you like, you can add fresh, diced mango to the bowl and add a splash of lime to the avocado.