Classic Pot-au-Feu

In a large pot, combine the onion and half each of the leeks, celery and carrots. Set the beef shanks and rump roast on top of the vegetables. Wrap the parsley, thyme and bay leaves in a piece of moistened cheesecloth and tie into a bundle. Add the bundle to the pot along with the peppercorns and 1 tablespoon of kosher salt. Add 2 of the marrow bones and the water. Bring to a boil over high heat, then reduce the heat to low, cover partially and simmer, skimming occasionally, until the rump roast is very tender, about 2 1/2 hours.

将小腿并烤成一个大碗并盖上盖子。过滤肉汤，然后将其归还到锅中。用高火煮沸，直到减少到10杯，约45分钟；从脂肪中脱身。

Add the remaining leeks, celery and carrots to the broth along with the parsnips, turnips and rutabagas. Cover and simmer over low heat until the vegetables are just tender, 30 minutes. Add the remaining 6 to 8 marrow bones and the potatoes. Cover and simmer until the potatoes are tender, 40 minutes.

Untie the rump roast and cut it across the grain into 6 to 8 slices. Cut the shank meat into 2-inch chunks; add the meats to the pot and simmer until heated through. Season with salt and pepper. Ladle the broth into shallow bowls. Add the meats, marrow bones and vegetables and serve, passing horseradish, mustard and sour cream at the table.