Preheat the Oven and Prepare the Beef: Preheat your oven to 325°F (160°C). Pat the brisket dry with paper towels, rub the meat generously with salt and pepper, and dust lightly with flour.
Sear the Beef: Heat olive oil and butter in a large Dutch oven or heavy casserole (with a lid) (Bräter) over medium-high heat. Sear the brisket on all sides until browned, then remove and set aside.
Cook the Vegetables: In the same pot, add the onions, carrots, parsnip, celery, leek, and garlic. Cook for 8–10 minutes, stirring occasionally, until softened and lightly browned. Stir in the tomato paste and cook for 1–2 minutes to enhance the flavour.
Braise the Brisket: Place the brisket back into the pot over the vegetables. Add enough water or beef broth to come halfway up the sides of the meat. Bring to a gentle simmer, cover tightly, and transfer to the preheated oven. Braise for 2,5 hours, flipping the brisket halfway through to ensure even cooking.
Finish and Serve: Remove the brisket from the pot and let it rest for 10 minutes. Blend the vegetables and braising liquid directly in the pot using an immersion blender for a smooth sauce, or strain the mixture for a lighter gravy. Taste and adjust seasoning. Slice the brisket thinly against the grain and serve with the sauce poured over or on the side. Enjoy!
For a relaxing atmosphere in the kitchen I recommend my personal Elle Republic: Chilled Out Kitchen Tunes Playlist on Spotify.