Cut the nori into quarter squares so it makes 12 pieces. Lightly grease the muffin pan and set aside. Preheat the oven to 425°F/ 218°C.
Pat dry the shrimp well with paper towels. Chop on a cutting board, then transfer to a bowl. Season it with salt, mayonnaise, Sriracha, and sesame oil. Toss well.
Add 1 heaping tablespoon of rice on each nori sheet, pressing down with the back of a spoon. Press each of them into the muffin pan.
Scoop 1 heaping tablespoon of the shrimp mix into each muffin cup.
Bake for 15 minutes or until the top browns slightly.
Garnish with white sesame, scallion, and ground pepper.
