Pour the oil in the Instant Pot and select “Sauté”. Then add the onion and garlic and cook for about 3 minutes.
Select “Cancel” and stir in the tomatoes, homemade tomato sauce, herbs, black pepper and broth. Next, secure the lid and select “Soup” and just use the default time of 10 minutes. Select “Cancel” and carefully do a quick release.
Remove the lid and stir in the sugar and vinegar and with an immerse blender, puree the soup.