01 - Rinse the rice under cold water until the water runs clear. Cook the rice with water in a rice cooker or pot according to package directions. While still hot, fold in the rice vinegar, sugar, and salt gently. Let cool to room temperature.
02 - Heat a splash of vegetable oil in a skillet over medium heat. Add the panko breadcrumbs and toast, stirring constantly, until golden brown and crisp. Remove from heat and set aside to cool.
03 - Combine the shredded crab meat with mayonnaise in a small bowl and mix until evenly incorporated.
04 - Place a sheet of nori shiny side down on a bamboo sushi mat. With damp hands, spread a thin, even layer of sushi rice over the nori, leaving a 1-inch gap at the top edge.
05 - Flip the nori so the rice side faces down. Arrange the crab salad, sliced avocado, and julienned cucumber in a line along the bottom edge of the nori.
06 - Using the bamboo sushi mat, roll the sushi tightly away from you, sealing the edge with gentle pressure.
07 - Sprinkle the toasted panko evenly over the top of each roll, gently pressing so the breadcrumbs adhere to the rice.
08 - Using a sharp, wet knife, slice each roll into 6 even pieces, wiping the blade between cuts for clean edges.
09 - Drizzle the rolls with unagi sauce and sriracha mayo. Garnish with thinly sliced scallions and sesame seeds. Serve alongside pickled ginger and wasabi.