Unroll fruit leather sheet, leaving paper attached. Cut licorice lengthwise into thin strips. Set aside.
In a large microwave-safe bowl, combine marshmallows and butter. Microwave, uncovered, on high for about 2 minutes or until melted, stopping to stir once or twice. Add cereal and stir in to coat.
Place about ½ cup (125 mL) cereal mixture along the edge of each fruit leather sheet; place licorice in the centre of the mixture. Roll up “sushi” to about 1 inch (2.5 cm) diameter, discarding paper as rolled. Trim edges of rolls; cut each into four pieces.
Fun Tip: Make fake wasabi with green-tinted marzipan and fake ginger from coconut slices soaked in water with a drop each red and yellow food colouring. Dry on parchment paper before plating.