In order to give your digestive system a complete rest, you want to have the broth on its own without any of the solid vegetable matter.
The majority of the nutrients, minerals, etc. are released into the water creating the broth. This broth is an extremely alkaline liquid that is perfect when cleansing. So don't worry about the cooked vegetables as all the nutrients are in the water now, you can't get much more use out of the strained vegetables.
Disclaimer: The Gabriel Method is not intended to treat, cure, or prevent any disease or illness. This information is intended for educational purposes only, not as medical advice. Always check with your doctor before changing your diet, eating, or health program.