In a small bowl, mix together a good squirt or spoonful of the chili paste, Sriracha, hot sauce, mayo, and chopped green onion. Set aside.
Lay a sheet of nori, shiny side down, on the bamboo mat (wrap with plastic wrap first). Wet your fingers with water, or use a spatula to spread a generous amount of rice evenly over nori sheet. Sprinkle black sesame seeds and some jalapeno seeds over the rice.
Turn the sheet of nori over so that the rice side is facing down. Line the edge of nori sheet at the bottom end of the bamboo mat.
Depending on how stuffed you like your sushi rolls will determine the next step. I like to grab 4-6 pieces of sliced tuna and line them along the bottom end of the nori sheet. Avoid over-stuffing or the sushi won't seal. Once I've determined if 4-6 pieces of tuna will be sufficient, I remove the tuna and dunk it in the spicy sauce. Once the tuna is thoroughly coated with the sauce, return it to the nori sheet. See notes.
Place 2-4 slices of jalapeno alongside the tuna. Top the tuna and jalapeno with some cilantro leaves.
Grab the bottom edge of the bamboo mat while keeping the fillings in place with your fingers, roll into a tight cylinder (if it's not tight enough, it will be difficult to cut). Lift the edge of the bamboo mat and continue to roll it forward while keeping gentle pressure on the mat.
Dampen a paper towel in water and wipe the blade of a very sharp knife, then cut the roll in half and then cut each half into 3 pieces. Clean the knife with the paper towel after every cut.
Put a dollop of the spicy mayo on top of each sushi and garnish with the remaining green onion.