In separate saucepans, boil the sweet potato for 15 minutes and the cabbage for 5 minutes or until soft.
Drain the excess water from the pans.
Add the butter and ProZero to the sweet potato and mash until smooth.
Mix the cabbage into the mash and serve.
ProZero is a food for special medical purposes and must be used under medical supervision. This recipe has been specifically designed for a low protein diet. Refer to labels for allergen and other product information.