Cut the chicken breasts in half horizontally to form 4 thin fillets. Sprinkle with Cajun seasoning and the olive oil and rub into the chicken. Leave to marinate for 20 minutes, longer if possible.
Fry or bbq the chicken for 5 minutes a side or until cooked through. Chop the avocado into rough chunks and combine with the coriander and lime juice and a good sprinkling of salt.
Top the buns with salad leaves, then the chicken and top with a tumble of avocado salsa.
