01 - Rinse sushi rice under cold water until water runs clear. Combine rice and water in a saucepan, bring to boil, cover, and simmer for 15 minutes. Remove from heat, keep covered, and let stand 10 minutes. Dissolve sugar and salt in rice vinegar, then fold into cooled rice. Bring to room temperature before using.
02 - Slice prosciutto into manageable strips. Cut fresh mozzarella into thin strips. Cut roasted bell pepper into thin strips. Julienne sun-dried tomatoes. Wash and dry basil and arugula leaves thoroughly.
03 - Place nori sheet on bamboo mat with shiny side down. With damp hands, spread thin, even rice layer over nori, leaving 1-inch border at top. Arrange prosciutto, mozzarella, bell peppers, sun-dried tomatoes, arugula, and basil in line along bottom third of rice. Drizzle with olive oil and season with black pepper.
04 - Using bamboo mat, roll sushi tightly away from you, applying gentle pressure. Seal 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 fresh basil leaves. Serve immediately while rice remains at room temperature.