Cut off the bottom quarter of each nori sheet; reserve for another use.
Combine chopped tuna, mayonnaise, green onions, and hot sauce in a bowl.
Center 1 sheet of nori on a bamboo sushi mat. Wet your hands. Spread a thin layer of rice on the nori using your hands; press into a thin layer, leaving a 1/2-inch space at the bottom edge. Sprinkle with sesame seeds. Arrange 1/4 of the tuna mixture in a line across the rice, about 1/3 of the way down from the top of the sheet.
Wet the uncovered edge of the nori. Lift the top end of the mat and firmly roll it over the ingredients. Roll it forward to make a complete roll. Repeat with remaining ingredients.
Slice the rolls into 3/4-inch pieces using a wet knife. Serve immediately or refrigerate until serving.
Adjust the hot sauce to taste, if desired.
Consuming raw seafood may increase your risk of foodborne illness, especially if you have certain medical conditions.
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