01 - 
                Cook the sushi rice according to manufacturer instructions. In a microwave-safe bowl, combine rice vinegar and white sugar, heating for about 30 seconds or until sugar dissolves. Pour over the cooked rice and mix until fully incorporated. Set aside.
              
              
              
                02 - 
                Set oven to 200°C (400°F) and allow to preheat fully.
              
              
              
                03 - 
                In a medium bowl, combine cubed salmon, light soy sauce, Kewpie mayonnaise, sriracha, and sesame oil. Stir until salmon is evenly coated.
              
              
              
                04 - 
                Cut each nori sheet into 4 equal squares or rectangles, sized to fit into muffin tin wells.
              
              
              
                05 - 
                Lightly grease a muffin tin with cooking spray. Place a nori square into each well, pressing down gently. Add a spoonful of seasoned sushi rice onto each nori, pressing lightly to form a base. Top with an even layer of salmon mixture.
              
              
              
                06 - 
                Place the filled muffin tin in the oven and bake for 15 minutes, or until the salmon is fully cooked with golden edges.
              
              
              
                07 - 
                Remove sushi cups from the oven and let them cool briefly. Drizzle with extra sriracha or spicy mayo, garnish with furikake and chopped green onions. Serve immediately.