Creating sushi rolls for kids is easy and fun if you follow these simple steps:

1. Rinse the Rice: Rinse the sushi rice under cold water until the water runs clear. This removes excess starch.
2. Cook the Rice: In a pot, combine the rinsed rice and water. Bring to a boil, then cover and reduce to low heat. Cook for 20 minutes, then remove from heat and let it sit for 10 minutes.
3. Season the Rice: In a small bowl, mix the rice vinegar, sugar, and salt. Heat gently until dissolved. Once the rice has rested, fluff it with a fork and gently fold in the vinegar mixture.
4. Prepare the Filling: While the rice cools, julienne the cucumber and slice the avocado. If using shrimp or crab, ensure it is cooked and cut into strips.
5. Prepare the Rolling Station: Place a bamboo sushi mat on a clean surface and lay a sheet of nori shiny side down on the mat.
6. Spread the Rice: Wet your hands to prevent sticking. Take a handful of sushi rice and spread it evenly over the nori, leaving about an inch at the top edge.
7. Add Fillings: Place a line of cucumber, avocado, and shrimp (if using) horizontally across the center of the rice.
8. Roll the Sushi: Using the bamboo mat, carefully roll the sushi away from you, pressing gently to form a tight roll. Seal the edge with a little water.
9. Slice the Roll: Use a sharp knife to slice the roll into bite-sized pieces. Wipe the knife with a damp cloth between cuts for clean slices.
10. Garnish: Sprinkle with sesame seeds if desired and serve with soy sauce for dipping.

These steps will guide you in creating delicious sushi rolls that your kids will love.