Place the bamboo sushi rolling mat on a flat surface. Place a sheet of parchment paper or saran wrap on top to prevent food from sticking to it.
Place a nori sheet on the parchment paper. *Note: Trim the nori sheet to your desired size.
Add sushi rice on top of the nori sheet. With damp fingers, spread the rice into a thin, even layer. Be sure not to leave any open gaps.
Sprinkle the rice with sesame seeds. I like using a mix of black and white sesame seeds.
Flip the nori sheet over. *Note: If you want the nori on the outside of the sushi roll, don't flip it over. Place the shrimp tempura on the nori sheet, with the tails facing outwards.
Add slices of carrots, cucumber, and avocado.
Gently lift the bottom of the bamboo mat up and carefully roll the sushi. Press and shape the roll as you go. Apply pressure so you get a firm roll.
When you reach the end of the nori sheet, apply cold water to seal the edge of the nori sheet.
Place the long strip of sweet plantain on top of the sushi roll.
Slice the sushi roll in half with a sharp knife on a cutting board. Then cut each half into four pieces, so you end up with 8 pieces of sushi. To get a nice clean cut, wet the knife with water each time you make a slice.
Drizzle the sushi roll with eel sauce and spicy mayo. Sprinkle with sesame seeds and sliced scallions. Serve and enjoy!