All ingredients ready? Let's begin!
In a saucepot over medium heat, warm the olive oil. Add the onion and cook until it is translucent, approximately 5 minutes, stirring a couple of times. Add the garlic and seasoning blend and continue to cook for another 30 seconds until the garlic and herbs are fragrant.
Pour the broth into the pot.
Add the beets, carrots, parsnips, cider vinegar, and salt.
Bring the broth to a boil. Reduce the heat to a low simmer and cook until the vegetables are soft, about 20 minutes. Turn the heat off and allow the broth to cool to room temperature.
Once cooled, ladle the broth and vegetables into a high-speed blender and process until you have a purée or sauce.
You might have to do this in 2 batches. Taste the sauce and check the consistency. Adjust by adding more salt and vinegar, if desired. Add a little broth if too thick.
You can return the sauce to the pot and warm it to serve over pasta right away or place it in air-tight containers and refrigerate or freeze it until ready to use.