Please refer to my previous posts on how to make sushi to prepare the following:
Spread the rice over the nori (seaweed sheet), however unlike last time, spread the rice right to the edges of the nori without leaving any margins.
Sprinkle a generous amount of mustard seed (or sesame seed) on the rice, like the picture. Then, spread enough cling film to cover the whole bamboo mat (makisu).
Flip over all the layers so that the cling film is now right above the bamboo mat. The layers from the top will now be the nori, the rice, the cling film, then the bamboo mat. Arrange the fillings across the nori as pictured. For today's sushi I've used prawns, strips of rolled egg and cucumber.