| 1 | Preheat oven to 350 degrees. |
| 2 | Place beef, onion, garlic, peppercorns and broth in an oven-proof casserole. |
| 3 | Add water to cover by 1 ?inches. |
| 4 | Bring to a boil. |
| 5 | Cover and bake in the oven about 2 hours, until beef is very tender. |
| 6 | Remove meat and cool. |
| 7 | Shred from bones, discarding any fat and the bones. |
| 8 | Cover. |
| 9 | Pour broth through a fine mesh strainer into a gravy separator or bowl. |
| 10 | Allow to cool. |
| 11 | Pour or skim off fat and return defatted broth to the casserole. |
| 12 | Add leeks, carrots and celery to casserole. |
| 13 | Bring to a boil; reduce heat and simmer, covered, 3 minutes. |
| 14 | Add shredded beef to broth with mushrooms, pasta, salt and pepper. |
| 15 | Bake, covered, for 5 minutes. |
| 16 | Remove from oven and stir in dill and parsley. |
| 17 | Serve immediately in deep soup bowls. |