In a medium pot, combine the beef bone broth, star anise, cinnamon stick, sliced ginger, and yellow onion.
Bring the broth to a gentle boil, then reduce heat and simmer for 15 minutes to infuse the aromatic flavors.
While the broth simmers, cook the rice noodles according to package instructions, drain, and set aside.
Slice the raw beef eye of round against the grain into very thin, translucent strips.
Remove the whole spices from the broth and stir in the fish sauce, sea salt, and black pepper.
Place the cooked noodles in a large bowl and top with the raw beef slices.
Pour the piping hot broth directly over the beef to cook it instantly until it turns a delicate pink.
Garnish with bean sprouts, cilantro, basil, and a squeeze of fresh lime juice before serving.