01 - Pat the salmon fillet thoroughly dry with paper towels. Cut into ¾-inch cubes and transfer to a mixing bowl. Drizzle with soy sauce and sesame oil, then season with freshly ground black pepper. Toss gently until evenly coated. Dust the cubes lightly with cornstarch, tossing again to ensure an even, thin layer on all sides.
02 - Heat a nonstick skillet over medium-high heat with a light drizzle of neutral oil. Once the pan is shimmering, place the salmon cubes skin-side down in a single layer without overcrowding. Sear for 3 to 4 minutes per side until each piece develops a deep golden crust and cooks through. Transfer to a plate lined with paper towels and set aside.
03 - While the salmon sears, thinly slice the cucumber and radishes. Cut the carrot into fine julienne strips. Slice the scallions on a sharp bias. Dice the avocado just before assembling to prevent browning. Roughly chop the cilantro or mint leaves.
04 - In a small bowl, combine the rice vinegar, freshly grated ginger, soy sauce, honey or maple syrup, toasted sesame oil, minced garlic, and lime juice. Whisk vigorously until the dressing is smooth and emulsified. Taste and adjust sweetness or acidity as desired.
05 - Spread the cooled rice in an even layer across a large shallow bowl or serving platter. Arrange the sliced cucumber, julienned carrot, radishes, scallions, and diced avocado in sections over the rice for a colorful presentation.
06 - Scatter the crispy salmon pieces over the arranged vegetables. Drizzle generously with the ginger dressing, ensuring even coverage across the entire dish.
07 - Finish with chopped cilantro or mint, a generous sprinkle of toasted sesame seeds, and nori strips or furikake if using. Serve immediately while the salmon remains hot and crispy.