Place 1 wrap on a board. Spread with half the avocado, leaving a 1cm border. Top with half the carrot, cucumber and tuna.

Drizzle with half the mayonnaise and sprinkle with half the lettuce. Roll up wrap tightly to enclose filling. Trim ends (if using round wraps).

Cut into 6 slices. Repeat with remaining wrap, avocado, carrot, cucumber, tuna, mayonnaise and lettuce.