2) For the burgers: Preheat a gas or charcoal barbecue or place a griddle pan over medium-high heat. In a large bowl, add the ground chicken, half a teaspoon salt, quarter of a teaspoon pepper, and half a teaspoon of the mayonnaise mixture. Using clean hands, gently combine the ingredients and form the chicken mixture into four patties. Place the burgers on the barbecue and cook for about seven minutes on each side. Transfer to paper towels and let rest for a few minutes.
3) Brush the cut side of each bap with the olive oil and one teaspoon of the mayonnaise mixture. Grill for one or two minutes until slightly golden.
4) To assemble the burgers: Spread a dollop of the remaining mayonnaise mixture on the tops and bottoms of the toasted baps. Place the chicken burgers on the bottom halves of the baps. Top each with a handful of rocket and finish with the top half of the bap.