Pat the pork loin dry with a paper towel, add the rub covering all sides and rub in well.
Press the saute/sear button on the pressure cooker and add the oil when hot.
Place the seasoned pork loin in the oil in the pot and brown on all sides, just a minute or two per side.
Remove the pork loin to a plate and add 3/4 cup water to the pot to deglaze it. Make sure to scrape all the brown bits from the bottom of the pot to prevent burning.
Add the pork loin back to the pot and pour the sauce over the top. Do NOT stir.
Cook on high pressure for 15 minutes then let naturally release pressure for an additional 15 minutes.
Release the rest of the pressure and open the lid once the pressure pin has dropped.
Remove the pork loin to a platter and cover with foil to rest.
Make the corn starch slurry by combining 3 tbsp corn starch and 6 tbsp cold water and stir until there are no lumps.
Press the saute/sear button and bring the sauce to a boil, whisking occasionally.
Pour in the slurry and whisk until thickened. Turn the pressure cooker off.
Pour some sauce over the pork loin and reserve the rest to serve with the meat.
Slice and serve warm. Enjoy!