Bring the stock to the boil in a large pan along with all the other ingredients up to and including the peppercorns. Reduce the heat, cover and simmer for approx. 5 mins. over a medium heat. Add the chicken, cover and leave to infuse on the switched-off hob for approx. 15 mins.
Heat the oil in a non-stick frying pan. Stir fry the garlic, courgette and tomatoes for approx. 5 mins., season.
Rocket & mint pesto
Puree the rocket and all the other ingredients up to and including the pepper. Stir in the cheese. Serve with the chicken and courgette strips.