Thinly slice the beef and set aside. Cook the rice noodles according to the package instructions, then drain and rinse with cold water.
Halve the onion and char it along with the ginger in a dry skillet until slightly blackened. Then, add them to the beef broth.
Add the cinnamon stick, star anise, fish sauce, and sugar to the broth. Simmer over low heat for 30 minutes to allow the flavors to meld.
Strain the broth to remove the spices and other ingredients, then bring it to a boil again.
Divide the cooked rice noodles among four bowls. Arrange the thinly sliced beef on top, then ladle the hot broth over the beef to cook it.
Garnish the soup with fresh cilantro, chopped scallions, and lime wedges. Add chili, if desired.
Serve hot, and offer additional lime wedges and chili for guests to add to their liking.
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