01 - Rinse sushi rice under cold running water until water runs clear, approximately 3-4 rinses. Combine rice and 2 cups water in a medium saucepan. Bring to a rolling boil over high heat, immediately reduce to low, cover tightly, and simmer for 15 minutes until water is absorbed. Remove from heat and let stand, covered, for 10 additional minutes. Meanwhile, dissolve sugar and salt in rice vinegar, stirring until completely incorporated. Transfer cooked rice to a wide shallow bowl, fluff with a fork, and gently fold in vinegar mixture. Cool to room temperature, fanning occasionally to achieve proper texture.
02 - While rice cools, prepare all filling components. Slice prosciutto into manageable strips. Cut fresh mozzarella into thin batons approximately 3 inches long. Julienne roasted red peppers and sun-dried tomatoes into uniform strips. Pick and wash fresh basil leaves, patting completely dry. Select 24 small, tender arugula leaves. Keep all ingredients separate and at room temperature for easy assembly.
03 - Place a nori sheet on a bamboo sushi rolling mat with shiny side facing down. Lightly moisten hands with water to prevent sticking. Spread approximately ¾ cup seasoned rice evenly over nori, leaving a 1-inch border at the top edge uncovered. Arrange prosciutto slices along the bottom third of the rice. Layer mozzarella strips, roasted pepper strips, sun-dried tomatoes, and fresh basil in a compact line over the prosciutto. Top with arugula leaves. Drizzle with ½ teaspoon olive oil and sprinkle lightly with black pepper.
04 - Using the bamboo mat, begin rolling from the bottom edge, applying firm, even pressure to create a tight cylinder. Roll forward until reaching the exposed nori border, then moisten the edge with water and seal completely. Repeat with remaining nori sheets and filling ingredients. Using a sharp knife dampened with water, slice each roll into 6 equal pieces, wiping the blade clean between cuts for neat presentation.
05 - Arrange sliced rolls on a serving platter or wooden board in circular or linear patterns. If desired, drizzle sparingly with balsamic glaze using a squeeze bottle for controlled application. Garnish with additional fresh basil leaves. Serve immediately at room temperature for optimal texture and flavor. Do not refrigerate after assembly as rice will harden.