Creating Spicy Shrimp Sushi Stacks can be straightforward with these step-by-step instructions:

1. Prepare the Rice: Rinse the sushi rice under cold water until the water runs clear. Add the rice and water to a rice cooker, or use a saucepan over medium heat. Bring to a boil, reduce to simmer, cover, and cook for about 20 minutes or until the water is absorbed. Let it sit covered for an additional 10 minutes.

2. Prep the Shrimp: While the rice cooks, heat olive oil in a skillet over medium heat. Add the deveined shrimp, sriracha sauce, and soy sauce. Sauté for about 5-7 minutes or until the shrimp are pink and cooked through. Remove from heat and let cool slightly.

3. Mix the Rice: Once the rice has cooled slightly, you can season it with rice vinegar (if desired) for extra flavor.

4. Prepare the Vegetables: Dice the avocado, slice the cucumber, and julienne the carrot. Set these aside for stacking.

5. Assemble the Stacks: Using a round mold or a small cup, layer the ingredients starting with a layer of sushi rice, then add shrimp, followed by vegetables. Repeat the process until you reach your desired height.

6. Garnish: Carefully remove the mold to reveal the beautifully stacked sushi. Sprinkle sesame seeds on top and add a strip of seaweed if desired.

7. Serving Suggestions: Place each stack on individual plates and accompany them with wasabi and pickled ginger to enhance the experience.