Trim fat from beef. Cut beef into 2-inch pieces. Combine salt and next 6 ingredients (salt through black pepper) in a small bowl. Sprinkle 2 tablespoons of spice mixture over beef, and toss to coat; reserve remaining spice mixture.
Preheat oven to 325°.
Heat 1 teaspoon oil in a large Dutch oven over medium-high heat. Add beef; cook 5 minutes, browning on all sides. Remove from pan. Heat 1 teaspoon oil in pan. Add onion, carrot, ginger, and garlic; sauté 8 minutes or until tender. Stir in broth, scraping pan to loosen browned bits. Return beef to pan. Add remaining spice mixture, coconut milk, lemon grass, and bay leaves. Bring to a boil. Cover and bake at 325° for 2 hours. Remove beef from pan using a slotted spoon; shred with 2 forks, set aside, and keep warm. Bring vegetable mixture to a boil over medium-high heat. Cook 10 minutes or until slightly thick. Discard bay leaves. Serve beef and vegetable mixture over noodles. Sprinkle with cilantro.
Note: You can find light coconut milk in the Asian or mexican section of most supermarkets. If yours does not carry it, ask your grocer to order it for you. For more information on availability, check out the Web site www.atasteofthai.com.