2 dessert apples, peeled, cored and cut into thin slivers
100ml/3陆fl oz chicken stock
salt and freshly ground black pepper
1 rounded tsp cornflour
1 tbsp oil
knob of butter
4 small duck breasts (about 140g/5oz each)
200ml/7fl oz apple juice, plus an extra tablespoon
100ml/3陆fl oz calvados