01 - Generously season the lamb pieces with salt and freshly ground black pepper.
02 - Heat 2 tablespoons of vegetable oil or unsalted butter in a large heavy-bottomed pot or Dutch oven over medium-high heat. Brown the lamb in batches until deeply seared on all sides. Remove the browned lamb from the pot and set aside.
03 - Add the chopped onions, sliced carrots, sliced parsnips, and sliced celery to the same pot. Sauté for approximately 5 minutes, ensuring to scrape up any browned bits from the bottom of the pot.
04 - Stir in the minced garlic and cook for 1 minute until a fragrant aroma develops.
05 - Return the browned lamb to the pot. Add the potato chunks, bay leaves, thyme sprigs, 4 cups of low-sodium beef or lamb stock, and 1 cup of water. Bring the mixture to a gentle boil, then reduce the heat to low.
06 - Cover the pot and simmer for 1.5 to 2 hours, stirring occasionally, until the lamb is exceptionally tender and the vegetables are cooked through.
07 - Carefully remove the bay leaves and thyme sprigs from the stew. Taste and adjust the seasoning with additional salt and pepper if needed.
08 - Ladle the hot stew into individual bowls, garnish with the chopped fresh parsley, and serve immediately.