In a large skillet, heat the olive oil over medium-high heat. Once hot, add the lamb cubes and brown them on all sides. This step adds flavor but is optional if you’re short on time.
In the crockpot, add the sliced carrots, cubed potatoes, sliced celery, chopped onion, and minced garlic.
Place the browned lamb on top of the vegetables in the crockpot.
In a separate bowl, combine the beef broth, tomato paste, thyme, rosemary, salt, pepper, Worcestershire sauce, and bay leaf. Stir well to mix the ingredients.
Pour the broth mixture over the lamb and vegetables in the crockpot.
Cover the crockpot and cook on low for 8 hours or high for 4 hours, until the lamb is tender and the flavors are well combined.
Once it’s done cooking, remove the bay leaf and stir the stew gently before serving. Optionally, garnish with fresh parsley for added flavor and color.