Pour the oil in the Instant Pot and select “Sauté”. Then add the onion and garlic and cook for about 3 minutes.
Select the “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 the “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.
Serve immediately with the garnishing of basil.