A Fixture of my cooking courses is a dish that consistently surprises and gladdens my students: pork braised in milk, a masterpiece of Bolognese cooking. (The recipe is given in The Classic Italian Cook Book on page 284.) It is the model on which I based this recipe for beef. In working with the beef, I have had to deviate slightly from the astonishing simplicity of the original, which contains, aside from the shortening, only pork and milk; Beef bein