In a large stock pot, add in beef bone broth, onion, carrots, garlic cloves, cinnamon sticks, star anise, cardamon pods, coriander seeds and coconut aminos.
Bring the broth to a boil over medium-high heat. Reduce heat to medium-low and let broth simmer for 30 minutes.
Place zucchini into a spiralizer and spiralize into noodles. Set aside.
Slice beef into very thin slices, about 1/2 cm thick. Keep beef slices in the refrigerator to keep cold until ready to add to the broth.
Strain the broth and discard the solids. Return the broth to the stove to keep warm.
In four soup bowls, prepare each serving by adding in zucchini noodles to the bottom.
Top with pho broth and add in 5–6 raw beef slices.
Top each bowl with desired amount of herbs, vegetables, sriracha and coconut aminos.
Serve immediately.