Asparagus, Watercress, Broad beans (frozen), Just cooked rice, Butter, Smoked trout fillets, Optional toppings:, Fine strips of ginger, Finely chopped favourite pickled vegetables, Finely chopped chives or spring onions, Fine strips of shiso herb (or basil), Crushed sesame seeds
A general rule: half a nori sheet, 80g sushi rice placed with a 2cm gap across the top; the cucumber should be 1cm square long strips - then it should work out fine (probably).
Hot cooked rice, Sushi vinegar, Nori sheets, Cucumber