Put the beef shank, beef squares, beef cube, water, fish sauce, onion, and peppercorn in the Instant Pot. Set on pressure cook for 45 minutes. Once done, let it naturally release for another 25 minutes, and then do a quick release.
Open the lid, and put the carrots and potatoes. Pressure cook again for 3 minutes. Once done, let it naturally release for at least 5 minutes, then do a quick release for the remaining amount of pressure.
Open the lid and add salt, to taste.
Click on saute mode, put the eggs in, and leave it in the Instant Pot for 7 minutes.
Once done, turn off the Instant Pot, take out the eggs and let cool. Pell the eggs and slice.
Assemble the dish by putting one beef shank, several beef squares, carrots, potatoes, and egg slices in a bowl with some soup broth. Enjoy.