You need to make up a large batch of sushi rice. You'll need more than you think, especially when you waste tons of it by getting it stuck all over your hands.
The best way to handle the rice or press the nigiri sushis is to run your hands underneath the cold water tap to cool them down, and then optionally to rub them with a little of the sushi vinegar mixture so the rice doesn't stick.
Now coat a sheet of nori with sushi rice and roll up what you fancy.

We also made a variety of tempura, which went down well, though the batter was not as crisp as it might have been.

Put the egg in a large bowl, stir without beating and set aside. Add the iced water, flour and baking powder. Stir two or three times, leaving some flour unblended.