Sushi is a popular Japanese dish prepared with ... a teaspoon of salt, half a cucumber, sliced into thin strips, one sheet of nori seaweed, sesame seeds and soy sauce for garnish.

Spread the strips of cucumber onto the salmon and add a sprinkling of spring onion. Carefully roll the sushi up into a sausage shape and slice it into 3cm/1in long pieces, trimming the ends.