1. In a saucepan, saute onion in olive oil for 5 minutes or until tender.
2. Place all ingredients into the Vitamix container in the order listed and secure lid.
3. Select Variable 1.
4. Turn machine on and slowly increase speed to Variable 10, then to High.
5. Blend for 5-6 minutes or until heavy steam escapes from the vented lid. Serve immediately.