01 - Rinse sushi rice under cold water until water runs clear. Combine rice and water in a saucepan; bring to a boil, then cover and simmer over low heat for 18 minutes. Remove from heat and let stand covered for 10 minutes.
02 - Whisk together rice vinegar, sugar, and salt in a small bowl until completely dissolved. Gently fold the seasoning mixture into the cooked rice using a cutting motion. Spread rice on a baking sheet to cool to room temperature.
03 - Once rice is cool enough to handle, form 8 to 12 compact rectangles approximately 2 by 1 inches each. Press firmly to ensure they hold their shape during frying.
04 - Heat vegetable oil in a large nonstick skillet over medium-high heat. Fry rice rectangles for 2 to 3 minutes per side until golden brown and crispy throughout. Transfer to paper towels to drain excess oil.
05 - Combine mayonnaise, Sriracha, soy sauce, sesame oil, lime juice, and chopped green onion in a mixing bowl. Add diced salmon and toss gently to coat evenly. Refrigerate until assembly.
06 - Divide crispy rice rectangles among 4 serving bowls. Top with spicy salmon mixture, arranging sliced avocado, cucumber, pickled ginger, sesame seeds, nori strips, green onions, and chili slices artistically over each bowl.
07 - Serve bowls immediately while rice remains crispy. Offer extra soy sauce and spicy mayonnaise on the side for additional seasoning.