Simmer for a further 5-6 minutes, then season, to taste, with salt and freshly ground black pepper. Pour the sauce over the chicken so that it is completely covered. Preheat the grill to high.
Remove the chicken and place it on a plate. Put the pan back on the heat and reduce the cooking liquid to about 250ml/9fl oz. Strain the reduced ... and simmer for 4-5 minutes.