Sauté Mode: Turn the Instant Pot to “Sauté” mode and add the olive oil. Once hot, add the diced onion, garlic, carrots, celery, purple potatoes, and squash. Stir frequently and sauté for about 3-4 minutes until the onions begin to soften. Add a splash of water if needed to prevent sticking.
Add Herbs & Seasoning: Stir in the dried herbs (thyme, basil, oregano, and rosemary) and salt. Sauté for another minute to let the flavors meld.
Deglaze with Vinegar: Pour in the red wine vinegar and cook for 1-2 minutes until most of the vinegar has evaporated.
Add Remaining Ingredients: Add the water and honey or maple syrup, stirring to combine.
Pressure Cook: Close the Instant Pot lid and set the valve to “Sealing.” Pressure cook on Manual (High Pressure) for 10 minutes.
Natural Release: Once the cooking time is up, let the Instant Pot do a Natural Pressure Release (NPR) for 10 minutes, then carefully turn the valve to “Venting” to release any remaining pressure.
Blend the Sauce: Open the lid and allow the contents to cool slightly. Use an immersion blender directly in the Instant Pot to blend the sauce until smooth, or transfer the mixture to a blender if needed. Adjust seasoning with additional salt or pepper to taste.
Serve or Store: Your Nomato sauce is now ready to serve or store. It can be refrigerated for up to 5 days or frozen for up to 3 months.
This method is quick and allows the vegetables to soften perfectly under pressure, making it even easier to blend into a smooth, delicious sauce!