Begin by preparing the shrimp. Defrost, peel, and devein them. In a bowl, combine the shrimp with garlic powder, paprika, salt, pepper, soy sauce, and oil. Mix thoroughly to ensure the shrimp are evenly coated with the marinade. Allow them to marinate for a few minutes.
Heat a bit of oil in a pan over medium heat. Add the marinated shrimp to the pan and cook for 2 to 3 minutes on each side, or until they turn pink and opaque. Once cooked, remove the shrimp from the heat and set them aside.
Wash the cucumber and cut it in half lengthwise. Using a spoon, remove the seeds and create a hollow center in each cucumber half, forming "boats." Fill each cucumber boat with cooked white rice, leaving some space on top for the shrimp. Place the cooked shrimp on top of the rice in each cucumber boat, arranging them neatly to ensure even distribution.
In a small bowl, mix the mayo and sriracha sauce or any hot sauce to create the spicy mayo dressing. Adjust the amount of sriracha to achieve your desired level of spiciness.
Drizzle the dressing over the shrimp and cucumber boats. Sprinkle sesame seeds on top of the assembled cucumber boats. Serve the Shrimp Cucumber Boats as a refreshing and flavorful appetizer or light meal. Enjoy this delightful dish!