In a deep bowl, make the spicy sauce by mixing the mayonnaise, mustard, chili, masago, sesame oil and chives.
Cut the tuna into small cubes and mix with the spicy sauce.
Set a sushi tablecloth on a clean surface. Lay a nori sheet with the shiny side down and the long side facing you.
Sprinkle sesame over the rice and roll the nori sheet so that the rice is on the bottom. Place a row of cucumber on the sheet on the side closest to you next to the cucumber one row of the spicy tuna. Roll the roll tightly using the sushi tablecloth 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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