Preheat the oven to 200°C / 400 F / Gas 6. Season the chicken well with salt and pepper.
Divide the leeks equally among four sheets of greased grease proof paper, about 23cm / 9in
square. Place a piece of chicken on top of each one.
Mix the carrots, olives, garlic and oil together. Season lightly and place on top of the chicken
portions. Top each with two of the anchovy fillets, then carefully wrap up each parcel, making sure
the paper folds are underneath and the carrot mixture on top.
Bake for 20 minutes and serve hot, in the paper, garnished with black olives and herb