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 to complete steaming.
02 - Whisk together rice vinegar, sugar, and salt in a small bowl until fully dissolved. Gently fold the seasoning mixture into the warm rice, being careful not to mash the grains. Allow rice 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 pieces on a parchment-lined baking sheet.
04 - Refrigerate the shaped rice pieces for 20 minutes until firm and set. This step ensures the rice maintains its shape during frying.
05 - Combine diced salmon, mayonnaise, sriracha, soy sauce, green onion, sesame oil, and salt in a medium bowl. Mix gently to incorporate all ingredients. Refrigerate until assembly.
06 - Heat 2 tablespoons neutral oil in a large nonstick skillet over medium-high heat. Fry rice pieces in batches, cooking 2 to 3 minutes per side until golden brown and crispy throughout. Transfer to paper towels to drain excess oil.
07 - Place a thin slice of avocado on each crispy rice piece. Top with a generous spoonful of spicy salmon mixture. Sprinkle with toasted sesame seeds and garnish with microgreens or chives.
08 - Arrange pieces on a serving platter and serve immediately with soy sauce on the side for dipping. Best enjoyed while rice remains crisp.