In a medium bowl*, combine chopped tuna with mayonnaise, sriracha and lemon juice.
On the bamboo sushi mat*, place 1 nori sheet. Using a rice spreader, or your fingers, spread a 1/4-inch-thick (0.5cm) layer of rice over the nori sheet, leaving about 1.5inch (4cm) margin on the top border.
Horizontally lay about 2 Tbs of spicy tuna mixture, starting at about 1 inch (2.5cm) from the bottom border.
Start rolling the bamboo mat towards the top border. Once you get there, moisten it with a bit of water, then press to seal.
Place the sushi roll on a clean chopping board and, using a very sharp knife, slice it into 8 pieces.
Repeat with the remaining nori and filling.
Serve with soy sauce, wasabi and pickled ginger, if desired.
Video
Notes
Please read the Tips & Tricks in the article before making this homemade spicy tuna roll recipe.Before rolling, cover the bamboo mat in cling film so there won't be any rice getting between the bamboo sticks.