Heat the grill to medium-high and line a baking tray with foil. Place the chicken between 2 sheets of cling film and bash to an even thickness using a rolling pin. Rub the Cajun spice mix and the oil all over the chicken, then put them on the baking tray. Grill for 10 mins, After five minutes turn the chicken and grill for another five minutes.

Top each chicken breast with a pineapple ring and some grated cheese, then return to the grill and cook for a further 2-3 mins until the cheese is golden and bubbling, and the chicken is cooked through. Meanwhile split the buns and roast them lightly.

Put a dollup of soured cream on the base of each bun, then drape some lettuce, one chicken breast some onion rings and a drizzle of ketchup. Complete the burger by adding the top of the bun and enjoy