How to Make It
Preheat the oven to 450° F. Rub the quatre épices all over the lamb shanks and season them generously with salt and white pepper.
Stand the lamb shanks in a heavy roasting pan. Roast in the center of the oven, uncovered, for 1 hour. Remove from the oven. Add the wine and the stock and cover. Return the lamb shanks to the oven and braise—without intervening—until the meat is very tender and just beginning to fall off the bone, about 1 1/2 hours.
Remove the pan from the oven and transfer the lamb shanks to a warmed platter. Season generously with salt and white pepper. Cover the lamb shanks with foil and let rest for 10 minutes. Strain the sauce through a fine-mesh sieve and serve.