Pour olive oil into your Instant Pot and add onions, tomatoes, black beans and bell pepper.
Press “Sauté” and cook for 3 minutes, until your veggies start to fry.
Adjust with salt.
Add also chili sauce and water and lock the lid.
Cook at high pressure for 5 minutes.
Quickly release the steam.
Fill each taco shell with some cooked veggies and also add some avocado, cabbage and sour cream.