You will need to be prepared for this one, requiring:
Rice – There is ‘Sushi’ Rice (short grain), but it really doesn’t matter too much what you use
Pressed Seaweed – Nori sheets
Bamboo mat (you can get the sheets and mats from the supermarket)
Filling – I used carrot and cucumber (kid friendly) but you might also like to try tuna or other seafood, Chicken Teriyaki (very Japanese), avocado, anything is fine, so long as it gets eaten by the children.
Also in preparation, once the rice is cooked, transfer it to a large bowl and sprinkle some rice wine vinegar (about 2 tbsp) or instead you can use a mix of white vinegar and half a tsp of sugar. Mix well, also helping the rice to cool. Cold rice is much easier to work with. Good luck.