Prepare Beef: Lay out beef, spread mustard, season, and layer bacon, onion, pickles. Roll and secure with twine.
Brown Rouladen: Sear rolls in butter and oil until well-browned. Set aside.
Sauté Aromatics: In same pot, cook onion, garlic, leek, carrot, and celery until soft.
Build Gravy: Deglaze with wine, add broth, tomato paste, seasonings, and return beef rolls.
Simmer: Cook covered on low for 90 minutes or until fork-tender.
Strain Gravy: Remove beef, strain vegetables, return liquid to pot.
Thicken: Use slurry to thicken, then whisk in butter and cream (optional).
Finish & Serve: Return rouladen to gravy, warm through, and serve hot.
