1. Preheat Oven & Brown Beef
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Preheat oven to 325°F (165°C).
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Heat olive oil in a large oven-safe pot or Dutch oven over medium-high heat.
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Add beef cubes in batches, browning them on all sides. Remove and set aside.
2. Sauté Vegetables
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In the same pot, add onion and garlic. Cook until onion is translucent.
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Stir in mushrooms and carrots, cooking until mushrooms are browned.
3. Add Flour & Liquids
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Mix in tomato paste and flour, cooking for 1 minute.
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Pour in beef broth and red wine (if using), scraping up browned bits from the bottom.
4. Simmer & Bake
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Return beef to the pot. Add thyme, rosemary, salt, and pepper.
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Bring to a simmer, cover, and transfer to the oven.
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Bake for 2–2.5 hours, or until beef is fork-tender.
5. Serve
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Remove from oven, stir, and adjust seasoning if needed.
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Serve hot over mashed potatoes or with crusty bread for dipping.