The national soup of Vietnam is a bowl of rice noodles, fresh herbs, and bean sprouts swimming in a fragrant broth.
1. To make Broth: Place all ingredients in large pot with 8 cups water. Cover, and bring to a boil. Reduce heat to medium-low, and simmer, covered, 1 hour. Strain broth, and return to pot. Discard solids.
2. To make Pho: Cook rice noodles according to package directions. Drain, and rinse under cold water. Divide among 6 large soup bowls. Ladle Broth over noodles, and top with tofu, sprouts, watercress, and green onions. Serve cilantro, basil, and lime wedges on the side to be stirred into soup.