Open Instant Pot. Select Saute.
Add your oil, ginger and green onions.
Then sear the outside of your beef shank.
Once seared, add both types of soy sauce, your rock sugar and water.
Add in star anise. Make sure it's submerged in liquid.
Close Instant Pot. Select the Meat/Stew button. This will set it for high pressure cooking for 35 minutes.
When done, let the pressure release naturally (around 10 minutes).
(Optional) Place in fridge for 4 hours with sauce.
Slice braised beef and serve with dipping sauce.
To make dipping sauce, combine 1/4 cup of the braised beef sauce with 1/2 teaspoon of sesame oil.