01 - Combine rinsed sushi rice and water in a saucepan. Bring to a boil, cover, reduce heat to low, and simmer for 15 minutes. Remove from heat and let stand covered for 10 minutes.
02 - Whisk together rice vinegar, sugar, and salt until fully dissolved. Gently fold the seasoning mixture into the warm rice. Allow to cool completely to room temperature.
03 - Moisten hands with water to prevent sticking. Form cooled rice into 12 compact rectangular or oval pieces, approximately 2 inches long and 3/4 inch thick. Arrange on a parchment-lined baking sheet.
04 - Refrigerate shaped rice for 20 minutes until firm and set. This prevents crumbling during the frying process.
05 - Combine diced salmon, mayonnaise, sriracha, soy sauce, green onion, sesame oil, and salt in a mixing bowl. Fold gently to incorporate. Refrigerate until assembly.
06 - Heat neutral oil in a large nonstick skillet over medium-high heat. Fry rice pieces in batches for 2 to 3 minutes per side until golden brown and crispy. Transfer to paper towels to drain excess oil.
07 - Place a thin avocado slice on each crispy rice piece. Top generously with spicy salmon mixture. Sprinkle with toasted sesame seeds and garnish with microgreens or chives.
08 - Arrange pieces on a serving platter. Serve promptly with soy sauce on the side for dipping while the rice remains crispy.