Preheat the oven to broil. Add onion halves and broil for 5 min.
In a large pot, add cinnamon stick, star anise, cloves and coriander. Toast for 1 min over med-high heat, then add mushrooms, onion and ginger. Saute for 4-5 min, then add broth and soy sauce. Bring to a boil, then let simmer for 20 min.
Meanwhile, prepare toppings and spiralize zucchini and daikon.
Drain broth into a large, heat-proof bowl. Discard mushroom mixture.
Add spiralized zucchini and daikon to a large bowl. Spoon broth overtop, then add as many toppings as you'd like. Enjoy!