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1
Toast star anise, cinnamon, cloves, and coriander seeds in a dry pot over medium heat, 2 minutes, shaking constantly.
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2
Add charred onion and ginger slices to pot; toast 3 minutes until fragrant.
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3
Add beef bones and water, bring to a boil, then reduce to a gentle simmer; cook uncovered 2.5 hours, skimming impurities after 20 minutes.
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4
Strain broth through fine-mesh sieve; discard solids, return to pot, season with salt and fish sauce.
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5
Cook rice noodles in boiling salted water according to package directions; drain and divide among four bowls.
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6
Bring broth to a rolling boil; ladle 350ml into each bowl over noodles.
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7
Top each bowl with thin beef slices, green onion, cilantro, basil, and chilies; serve lime wedges on the side.