Add the beef stock and simmer to reduce again, until the gravy is thickened, then season, to taste, with salt and freshly ground black pepper. For the calf's liver, rub the calf's liver with the ...

Put 400g/14oz of the flour into a large bowl and season with salt and freshly ground black pepper. Heat half the oil in a large frying pan over a high heat. Coat the liver in the seasoned flour ...