Tip it out like a sandcastle.Use damp hands to roll walnut-sized balls of rice and place on the topping.Lay a nori sheet on the mat, shiny-side down.

Stick down the sides like a stamp.Line a loaf tin with cling film, then place a thin layer of smoked salmon inside on top of the cling film.

To serve with all styles of sushi wasabi (optional - and fiery!) wah-sarb-ee, the Japanese answer to horseradish, wasabi is related to watercress and grows in a similar way, pickled ginger jin-jer, mainly grown in Jamaica, Africa, India, China and Australia, ginger is the root.If you would like us to send you email updates about offers, competitions and new dishes.Wonder and Lightning jump in: And that guy Jiro, from Jiro Dreams of Sushi!