Preheat oven to 400 degrees F. Cut the nori squares into quarters. Toss the fish in a bowl with the rest of the fish ingredients and marinate for 4 hours. Don’t marinate any longer as the fish will start to break down. Add a heaping tablespoon of rice to each nori square and spread out slightly. Transfer the square to a muffin tin, pressing down gently so the sides of the nori come up the sides of the muffin cup and the rice is in the middle. Fill each cup with the fish. Put the pan in the oven and bake for 15-17 minutes. Broil for 1-2 minutes at the end to give the fish a little color. Remove from pan and allow to cool slightly. Top with and or all of the toppings and drizzle with the spicy mayo.