In a large soup pot, combine broth, onion, ginger, lemon grass, cinnamon, and peppercorns.Bring to a boil, reduce heat, and cover.Simmer for 1 hour.
Arrange bean sprouts, mint, basil, and cilantro on a platter with chilies and lime.
Soak the noodles in hot water to cover for 15 minutes or until soft. Drain. Place equal portions of noodles into 6 large soup bowls, and place raw beef on top.Ladle hot broth over noodles and beef.Pass platter with garnishes and sauces.
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