Select the sauté function of the Instant Pot. Add the olive oil and onions. Cook for around 5 minutes, until onions are soft and translucent. add the garlic; cook for 1 minute. Add the tomato paste and cook for 2 more minutes.
1
Deglaze
Add 1-2 cups of stock. Add the rest of the stock, celery, carrots, zucchini, oregano, basil, salt, diced tomatoes and elbow pasta. Stir to combine.
2
Cook
Put the lid on the Instant Pot, set the valve to 'sealing', and pressure cook on high pressure for 6 minutes.
3
Serve
Stir in the kidney beans and parmesan cheese. Serve with additional parmesan and bread for dipping.