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

1. Cook the Rice: Rinse the sushi rice under cold water until the water runs clear. Combine it with 1 ¼ cups of water in a pot and cook according to package instructions. Once cooked, remove from heat and let it sit, covered, for 10 minutes.

2. Prepare the Seasoning: In a small bowl, mix rice vinegar, sugar, and salt. Microwave for 30 seconds until sugar dissolves, then gently fold this mixture into the cooked rice. Allow it to cool to room temperature.

3. Cook the Shrimp: Heat a skillet over medium heat and add a drizzle of oil. Once hot, add the shrimp and season with salt. Cook for 2-3 minutes on each side until the shrimp turns pink and opaque. Remove from heat.

4. Make Spicy Mayo: In another small bowl, combine mayonnaise and sriracha sauce. Stir until uniform. Adjust the sriracha quantity for preferred spice level.

5. Assemble the Stacks: Use a round mold or a glass to create stacks. Start by layering a small amount of sushi rice at the bottom. Follow with sliced avocado, a layer of shrimp, a sprinkle of green onions, and a drizzle of spicy mayo.

6. Repeat Layers: Continue layering until you reach your desired height, ending with shrimp and spicy mayo on top. For an added touch, sprinkle sesame seeds.

7. Remove the Mold: Carefully lift the mold or glass to reveal your beautiful sushi stack. Repeat the process for remaining ingredients.

8. Chill (Optional): If desired, chill the assembled stacks in the refrigerator for a few minutes to firm up before serving.

9. Serve with Soy Sauce: Arrange on a platter with additional spicy mayo and soy sauce on the side for dipping.

With these clear instructions, you will find the process enjoyable and the outcome impressive!