01 - Rinse sushi rice under cold water until water runs clear. Combine rice and water in a saucepan, bring to a boil, cover, and simmer for 15 minutes. Remove from heat and let stand covered for 10 minutes. Dissolve sugar and salt in rice vinegar, then fluff rice with a fork and stir in vinegar mixture. Cool to room temperature.
02 - While rice cools, slice prosciutto into strips, cut mozzarella into thin strips, julienne roasted bell pepper and sun-dried tomatoes. Keep fresh basil and arugula leaves ready for assembly.
03 - Place nori sheet on bamboo sushi mat with shiny side down. With wet hands, spread thin even layer of rice over nori, leaving 1-inch edge at top. Arrange prosciutto, mozzarella, roasted peppers, sun-dried tomatoes, arugula, and basil along bottom third. Drizzle with olive oil and sprinkle with black pepper.
04 - Use bamboo mat to roll sushi tightly away from you, sealing edge with water. Repeat with remaining ingredients. Using sharp damp knife, slice each roll into 6 equal pieces.
05 - Arrange sushi pieces on serving platter. Drizzle with balsamic glaze if desired and garnish with additional fresh basil leaves. Serve immediately while fresh.