Shepherds Pie

Name: Shepherd's Pie
Ingredients: 1 teaspoon plus 2 tablespoons unsalted butter; 1 1/2 cups diced onion; 2 large cloves garlic, minced; 2 teaspoons chopped fresh thyme leaves; 2 pounds ground lamb; 1 teaspoon kosher salt, plus more as needed; 1/4 teaspoon freshly ground black pepper, plus more as needed; 3 tablespoons tomato paste; 1 cup canned crushed tomatoes; 1 bay leaf; 3 tablespoons minced flat-leaf parsley leaves; 1/2 pound button or cremini mushrooms, trimmed and quartered; 3 cups glazed carrots and turnips, recipe follows; 1 large egg; 4 cups mashed potatoes, recipe follows; 1/4 cup grated farmhouse cheddar (optional); 3/4 pound turnips, cut into 1-inch pieces; 3/4 pound carrots, cut into 1-inch pieces; 2 teaspoons unsalted butter; 1/2 teaspoon sugar; Kosher salt and freshly ground black pepper; 2 pounds russet potatoes (about 4 medium), peeled and cut into 1-inch pieces; 1 teaspoon kosher salt plus more; 3/4 cup whole milk; 1/4 cup unsalted butter; Freshly ground black pepper; Freshly grated nutmeg (optional)