1. If your roast chicken is not already shredded or diced, prepare it by pulling it apart with forks or chopping it into small, bite-sized pieces. Ensure there are no bones or skin if you prefer.

2. Finely dice the bell pepper and gherkins. The smaller the dice, the better they will integrate into the salad.

3. In a medium mixing bowl, combine the shredded/diced chicken, crumbled feta cheese, finely diced bell pepper, and finely diced gherkins.

4. Add the mayonnaise to the bowl. Stir gently until all ingredients are well combined and coated with the mayonnaise.

5. Season with salt and black pepper to your preference. Remember feta cheese is already quite salty, so taste before adding too much salt.

6. Wash and thoroughly dry the lettuce leaves. Arrange 3 large lettuce leaves per serving on a plate.

7. Spoon half of the chicken and feta mixture into the center of each set of lettuce leaves. Serve immediately as a delicious, refreshing wrap.