Plug in the Instant Pot, remove the lid, then select the sauté function.
When the "hot" indicator is on, add 1 tbsp of neutral oil, swirling to coat evenly, then add the pork belly pieces and sear for about 1 minute.
Transfer all the braising liquid ingredients to the inner pot, then stir until well incorporated.
Close the lid, ensure the steam valve is in sealing position, then cancel the sauté function and cook on high pressure for 25 minutes.
When time is up, allow the pressure to naturally release completely, then remove the lid, hit cancel and select sauté again.
Make the corn starch slurry by mixing 1 tbsp of water with 1 tbsp of corn starch.
When the liquid in the Instant Pot begins to bubble, pour the corn starch slurry into the inner pot and gently mix until sauce thickens.
Optionally, garnish the dish with chopped scallions. Enjoy!