Step 1

Put water and cherry tomatoes in the Instant Pot.  Close the lid and turn the vent to a Sealing position.  Press the "Pressure Cook" or "Manual" button and set the time to 5 minutes on High pressure.

Step 2

When it's done cooking, quick release (QR) the steam and open the lid.  Transfer cooked cherry tomatoes and liquid to a blender or food processor and process until smooth.

Step 3

Add oil and minced garlic to the Instant Pot.  Press the "Saute" button and set the time to 15 minutes.  After 1 minute, add the cherry tomato mixture and Italian seasoning to the Instant Pot.  Cook, stirring every 30 seconds, for 5 minutes, or until the desired thickness of the tomato sauce is reached.