01 - Heat olive oil in a large Dutch oven or heavy-bottomed pot over medium-high heat.
02 - Season the lamb cubes with salt and black pepper. Brown the lamb in batches, turning to sear all sides. Remove and set aside.
03 - In the same pot, add onion and celery; sauté for 4 minutes until softened. Add garlic and cook for 1 minute.
04 - Stir in tomato paste and cook for 1 minute to develop flavor.
05 - Return the browned lamb to the pot. Add carrots, parsnips, turnips, and potatoes.
06 - Pour in the stock, add bay leaves, thyme, and rosemary. Stir well to combine.
07 - Bring to a gentle simmer. Cover and cook on low heat for 2 hours, stirring occasionally, until the lamb and vegetables are tender.
08 - Remove bay leaves. Taste and adjust seasoning as needed.
09 - Ladle stew into bowls, garnish with chopped parsley, and serve hot.