Wash rice until the water runs clear. Add equal parts water and rice to a saucepan or rice cooker. If cooking over the stove, bring to a boil and reduce to low. Cover and allow to cook for 20 minutes.
Once cooled, season the rice with rice vinegar, sugar and salt. Mix well and set aside.
For the shrimp
Season shrimp with garlic powder, white pepper and a little soy sauce.
Sear the shrimp in a hot pan for 2-3 minutes on both sides. Remove from the pan and chop into pieces.
To a bowl, add the chopped shrimp, sriracha, spicy mayo, soy sauce and green onions. Mix until combined.
For the hand rolls
Cut nori in half and place rough side up. Add 1-2 spoonfuls of cooked sushi rice to the top half corner of the nori sheet. Place the spicy shrimp mix, 2 avocado slices, and cucumber slices in the middle of the rice at an angle.
Pull the filled corner towards the middle making sure the filling ingredients stay in place. Then use the other hand to pull the other corner. Wrap the nori until there's no more to wrap it should make a cone shape. Use a few pieces of rice in the corner to seal the hand roll.
Drizzle eel sauce, spicy mayo, Sriracha. And garnish with green onions and sesame seeds.