Vegan Sushi

Name: Vegan Sushi
Ingredients: 2 cups sushi or short grain white rice; 2 1/4 cups cold water; 5 tablespoons rice vinegar; 2 tablespoons raw sugar; 1/2 teaspoon fine sea salt; 6 sheets nori; 1/4 cup mayonnaise (vegan if necessary); 1 ripe avocado, sliced; 1 small cucumber, sliced; 2 tablespoons toasted sesame seeds; pickled ginger, wasabI, and gluten-free soy sauce, to serve