Thoroughly clean the beef and set a side.
Sauté ginger, green onion, garlic, onion, star anise, ground black pepper and nutmeg powder with olive oil in your pressure cooker.
Add the beef and the rest of the ingredients except for salt and chives. Start with 12 cups of water. Boil and simmer for 15 minutes. Cover your pressure cooker and cook for 40 - 50 minutes over medium high heat.
Switch off heat and let the pressure naturally dissipate, about 15 minutes, before removing the lid.
Remove the chunk of beef and chop to desired size.
Remove the solids in the broth by filtering. Pour back the broth and beef into the pressure cooker. Add more water and salt if necessary. Simmer for another 10 minutes. Garnish with chopped chives.
Best serve with garlic fried rice or egg noodle.