Prepare the ingredients: peel and chop the vegetables. Cut the beef into large chunks.
In a large Dutch oven or pot, heat the oil over medium-high heat. Sear the beef on all sides until golden brown. Remove from the pot and set aside.
In the same pot, sauté the onion until softened. Add the garlic and chopped vegetables. Season with salt and pepper, and add the bay leaves.
Return the beef to the pot and add enough water to cover. Bring to a simmer, then cover and cook over low heat for 2-2.5 hours, or until the beef is very tender.
Once the beef is tender, remove it from the pot. Using an immersion blender or a regular blender, blend the remaining vegetables and cooking liquid until smooth.
Stir in the sour cream, mustard, and lemon juice into the sauce until smooth. If necessary, thicken the sauce with a little flour mixed with cold water (slurry).
Return the beef to the sauce and heat through for a few minutes.
Serve hot with bread dumplings (zsemlegombóc) or pasta.
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