1. In a large pot, add the onion, garlic, ginger, cinnamon sticks, and star anise. Dry roast them on medium heat for about 5 minutes until fragrant.
2. Add the vegetable broth, water, soy sauce, and maple syrup to the pot. Bring to a boil, then reduce the heat and let it simmer for 30 minutes.
3. While the broth is simmering, cook the rice noodles according to the package instructions. Drain and set aside.
4. Strain the broth to remove the solids. Return the broth to the pot and keep it warm.
5. To serve, divide the cooked noodles among bowls. Pour the hot broth over the noodles. Top with bean sprouts, fresh herbs, lime wedges, and jalapeño slices.