In a medium bowl, mix together the sriracha sauce, sesame oil, light soy sauce and Kewpie mayonnaise. Set aside.
Chop the tuna into small cubes, then run your knife through it a few more times to chop it even finer. Add to the sauce and mix well to completely coat.
Fill a tray or shallow bowl wide enough to fit the rice paper sheet with water, then damp a chopping board (or a clean tea towel) to wrap the rice paper dumplings on.
Dip a rice paper sheet in water for a few seconds and place on the damp surface. Add a rectangle of seaweed, then lay on about a tablespoon of rice. Top with the cucumber and avocado, a generous spoon of the marinated tuna and a few jalapeño slices.
Starting at the bottom, fold over the rice paper sheet to cover the filling. Then fold the top of the sheet over the filling, then repeat with the sides so you are left with a square/rectangle shaped pocket.
Repeat this process until all the filling has been used.
Sprinkle a plate with sesame seeds, then roll each parcel to coat.
Heat a little oil in a medium-sized non-stick frying pan set over a medium-high heat. Pan fry the rolls in batches for a few minutes on each side until lightly golden - watch closely to ensure the sesame seeds don’t burn or they will become bitter.
Mix together the soy sauce and rice wine vinegar in a small bowl and add a pinch of sugar, to taste.
Serve the crispy rice paper rolls with the dipping sauce, sprinkled with chives and spring onions. Enjoy!