In a deep bowl, make the spicy sauce by mixing mayonnaise, mustard, chili, masago, sesame oil, and scallions.
Cut the tuna into small cubes and mix with the spicy sauce.
Place a sushi mat on a clean surface. Put a nori sheet with the shiny side down and the long side facing you.
Sprinkle sesame seeds over the rice and flip the nori sheet so the rice is on the bottom. Place a row of cucumber on the sheet closest to you, along with a row of the spicy tuna. Roll the roll tightly using the sushi mat as your guide.
With a sharp, wet knife, cut the sushi roll into 8 pieces. Repeat with the other 3 rolls and serve.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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