Trim the excess fat off the stew meat. In a large saucepan over high temperature, heat the olive oil until smoking hot. Add the lamb and the 8 cloves garlic and brown the lamb well, about 2 minutes per side. Add the onion, turnip, carrots, and red wine and boil for 3 to 4 minutes, or until about 1/2 cup/120 mL/4 fl oz of the liquid remains. Add the stock and simmer for 45 minutes to 1 hour, or until the lamb is tender. After the lamb has been cooking for about 20 minutes, prepare the Garlic Mashed Potatoes. Place the potatoes and 5 cloves garlic in a large saucepan and cover them with water. Boil the potatoes about 30 minutes, or until tender, then drain them. Return the potatoes to the pot and mash well. Add the cream and butter and mix well. Season with salt and pepper and keep warm. When the lamb is tender, add the rosemary, marjoram, and salt and pepper to taste. Divide the Garlic Mashed Potatoes among 6 bowls. Ladle the Lamb Stew over the potatoes and garnish with fresh sprigs of rosemary. Serve hot. Serves 6 Per serving: 956 Calories (kcal); 27g Total Fat; (28% calories from fat); 16g Protein; 132g Carbohydrate; 31mg Cholesterol; 326mg Sodium Food Exchanges: 5 Grain(Starch); 0 Lean Meat; 8 1/2 Vegetable; 0 Fruit; 5 Fat; 0 Other Carbohydrates Converted by MM_Buster v2.0n.