Heat 1/4 inch of oil over medium heat in a nonstick pan.
Whisk the tempura batter with 3/4 cup of ice water in a shallow bowl. Dredge shrimp in the batter and place into the hot oil. Fry shrimp until golden brown, about 1-2 minutes per side.
Remove onto a paper towel-lined plate.
Rice Cooker Instructions
Place 1 cups of uncooked sushi rice into the rice cooker. Pour in 2 cups of water. Turn on the rice cooker.
Once the rice cooker turns itself off, let the rice steam for 10-20 minutes.
Stovetop Instructions for Rice
Bring 2 cups of water to a boil in a small saucepan. Stir in 1 cup of sushi rice using a rice paddle or wooden spoon. Cover and reduce heat to low.
Cook rice, covered, 10-15 minutes until the water is absorbed.
Sushi Roll Instructions
Peel the avocado. Slice into long, thin strips. Slice the imitation crab into long, thin strips. Set aside.
Make the spicy mayo: combine mayonnaise and sriracha in a small bowl. Set aside.
Lay the bamboo mat on a flat surface. Cover the bamboo mat with a layer of plastic wrap. Press 1 cup of rice down into a rectangular shape, leaving a perimeter of bamboo mat showing.
Cover the rice with another piece of plastic wrap. Use a rolling pin to smooth and flatten the rice. Remove the plastic wrap and lay a piece of nori on top of the rice (shiny side down).
Arrange the avocado and shrimp tempura in a line across the center of the nori sheet. Drizzle with eel sauce.
Starting from the bottom, holding on to the bamboo roller, fold the roll up and over the fillings. Press it down firmly. Rotate the roll 90 degrees and repeat the same action, folding the roll up and over the fillings. Press firmly.
Slowly release the bamboo map and unwrap the sushi roll from the plastic wrap. Using a wet knife, gently slice the roll into 8 pieces.
Carefully lay the strips of crab meat over the pieces of sushi. Drizzle with spicy mayo and sprinkle with chopped scallions and sesame seeds.