Char the ginger piece and star anise in a dry pot over medium-high heat until fragrant and slightly blackened.
Pour in the beef bone broth, cinnamon stick, and tamari, then bring to a gentle simmer for 15 minutes to develop the deep aromatics.
While the broth simmers, cook the rice noodles according to package directions until tender, then drain and set aside.
Thinly slice the raw beef eye of round against the grain into paper-thin strips using a very sharp knife.
Place the cooked noodles in a large deep bowl and top with the raw beef slices and fresh bean sprouts.
Remove the ginger, star anise, and cinnamon from the boiling broth and pour the piping hot liquid directly over the beef to cook it instantly.
Garnish with fresh cilantro, Thai basil, sliced scallions, sea salt, black pepper, and a squeeze of lime before serving.