Fill up the cloth with all the aromatics ingredients. (star anise, cinnamon stick, cardamom, cloves, and bay leaves) - set aside
Then, fill up the soup pot with 12 cups of water and ring to a boil.
Add beef brisket and 2 slices of ginger. Cook for a few more minutes.
When you see some foam floating on the top of the water, skim it off. You don't want these impurities from the beef. It will make the soup cloudy. Turn off the heat - set aside
Get another soup pot or large saucepan. Pour olive oil, stir fry the white parts of spring onions, and some garlic with medium heat. Cook until fragrant and slightly seared.
Grad the beef soup, pour into the spring onion and garlic pan. Add both soy sauces and stir well.
Add the cloth filled aromatic spices, daikon and shitake. Turn the heat down to low and simmer up to 90 minutes or until the beef is tender and the broth is tasty.
After 90 minutes, remove the aromatic cloth, and adjust the flavour with a little bit of salt or mushroom stock.
Then, cook the noodle according to the package instruction and blanch the bok choy in the noodle water.
Serve the noodle, alongside with bok choy and grab a spoonful of beef brisket broth into the bowl. Garnish with the green part of the spring onion.