Break up a piece of cooked salmon on a plate into small pieces and then place them in a large bowl. Next, add the cooked jasmine rice (or sushi rice if preferred) to the bowl.
Toss with the sriracha and mayonnaise and then add a splash of soy sauce.
Pour the contents onto the seaweed sheet and press with a spoon or hands, wetting hands if needed to prevent sticking. Place sliced cucumber down the center.
Roll it up gently and cut into 8 sushi circles with a sharp knife.