01 - Heat 2 tablespoons of olive oil in a large Dutch oven or heavy-bottomed pot over medium-high heat. Add beef chuck cubes in batches, ensuring not to overcrowd the pot, and brown thoroughly on all sides. Remove the browned beef and set it aside.
02 - In the same pot, add the diced onion, celery, and sliced carrots. Sauté for approximately 5 minutes until the vegetables begin to soften. Stir in the minced garlic and cook for an additional minute until fragrant.
03 - Stir in the tomato paste and cook for 1 minute, allowing it to deepen in color. Return the browned beef to the pot.
04 - Pour in the beef broth. Add the rinsed pearl barley, fresh thyme leaves, bay leaves, salt, and black pepper. Bring the mixture to a boil, then reduce the heat to low, cover the pot, and let it simmer gently.
05 - Continue to simmer for 1.5 to 2 hours, stirring occasionally, until the beef is fork-tender and the barley is fully cooked and plumped. The stew should be thickened.
06 - Carefully remove and discard the bay leaves from the stew. Taste the stew and adjust the seasoning as needed with additional salt or pepper.
07 - Ladle the hot stew into individual serving bowls. Garnish with fresh chopped parsley, if desired, before serving immediately.