Creating your own Spicy Shrimp Sushi Stacks is straightforward if you follow these steps:

1. Cook the Shrimp: In a skillet over medium heat, add the shrimp. Cook until pink and opaque, about 2-3 minutes per side. Remove from heat.
2. Mix Sauce: In a small bowl, combine sriracha sauce, mayonnaise, and sesame oil. Mix until smooth.
3. Prepare Rice: In a bowl, combine cooked sushi rice, rice vinegar, sugar, and sea salt. Mix thoroughly and set aside.
4. Cut Vegetables: Dice the avocado and thinly slice the cucumber. Prepare the green onions by chopping them finely.
5. Mix Shrimp and Sauce: Toss the cooked shrimp in the sriracha mixture until evenly coated.
6. Start Stacking: In a ring mold or a round bowl, layer sushi rice at the bottom. Press down gently.
7. Add Shrimp Layer: Add a layer of spicy shrimp over the sushi rice and press lightly to adhere.
8. Layer Vegetables: Follow with a layer of diced avocado and cucumber slices, followed by additional sushi rice.
9. Final Touch: Press down to compact each layer. Carefully lift the mold to reveal the stacked formation.
10. Garnish: Top with chopped green onions and sprinkle sesame seeds. If desired, place nori strips around the stack for decoration.