01 - Heat olive oil in a large heavy-bottomed pot or Dutch oven over medium-high heat. Season the beef cubes with salt and pepper, then brown in batches to avoid overcrowding. Sear each batch until deeply golden on all sides, approximately 3–4 minutes per batch. Transfer the browned meat to a plate and set aside.
02 - Reduce the heat to medium. In the same pot, add the onions, carrots, and celery. Sauté for 5 minutes, stirring occasionally and scraping up any browned bits from the bottom of the pot to incorporate the fond into the vegetables.
03 - Stir in the minced garlic and tomato paste. Cook for 2 minutes, stirring constantly, until the garlic is fragrant and the tomato paste has darkened slightly in color.
04 - Pour in the dry red wine, scraping the bottom of the pot to release any remaining caramelized bits. Allow the wine to reduce by half, approximately 5 minutes, concentrating the flavor.
05 - Return the seared beef and any accumulated juices to the pot. Add the cubed potatoes, beef stock, bay leaves, rosemary sprig, and dried thyme. Stir to combine, then bring the mixture to a gentle simmer.
06 - Cover the pot and reduce the heat to low. Cook for 2 hours, stirring occasionally, until the beef is fork-tender and the sauce has thickened into a rich, glossy stew.
07 - Remove and discard the bay leaves and rosemary sprig. Taste the sauce and adjust the seasoning with salt and pepper as needed. Ladle into warm bowls and serve alongside rustic bread, creamy polenta, or over mashed potatoes.