Simmer chicken broth with spices like star anise, cinnamon bark, bay leaf, peppercorns.
As an option, if you have dried mushrooms handy, reconstitute and add the mushroom broth for added flavor.
Season with soy sauce or tamari, mirin, and fish sauce. Remove whole spices.
Poach eggs and add frozen udon and tatsoi. You can use other greens you like.
Serve and enjoy.