Put the Instant Pot (IP) on saute mode, high. When the IP is ready, add the oil. Sear the pork loin on both sides, about 1-2 minutes per side, until browned. Remove the pork loin from the IP and set aside. It will not be cooked through.
Without cleaning the pot, add the chopped bell peppers, jalapeno and onion. Stir every 2-3 minutes until the onions are tender and the peppers have softened. Use a slotted spoon or tongs to remove the veggies from the IP. Place into a bowl and set aside.
Turn off the IP. Place a few rings of pineapple on the bottom of the IP, put the seared pork loin on top, and then place more pineapple rings on top of the pork. Spread the frozen pineapple, baby corn, garlic, basil and the sauted onions and peppers around the sides of the pork loin.
In a bowl, whisk together the tamari, honey, mustards, liquid smoke, rice vinegar, minced ginger, water and cornstarch slurry. Pour the sauce over the top of the contents of the IP.
Turn the IP to pressure cook mode, low. Set for 10 minutes. Make sure the seal is not set to vent. When the IP is pressurized the timer will begin. When the timer goes off, carefully perform a quick release or let the IP depressurize naturally over about 15 minutes.
Remove the pork loin from the IP. Turn the IP off and then turn on the saute mode to more/high. Bring the liquid to a rolling simmer to thicken. Meanwhile, slice the pork loin. Return the sliced loin to the pot and cook until the sauce has thickened up, about 5-10 more minutes. Serve hot and enjoy!