Preheat the oven to 200°C/180°C fan/Gas mark 6.
Parboil the parsnips for about 5 minutes until slightly soft.
Drain and rinse in cold water.
Layer the parsnip and onion in an ovenproof dish.
In a separate pan, add the ProZero and 150g Violife and bring to the boil, stirring until the Violife has melted.
Pour the mixture over the parsnip and onion layers and sprinkle the remaining Violife over the top.
Cook in the oven for 30 minutes and serve.
ProZero is a food for special medical purposes. This recipe has been specifically designed for use in a low protein diet. Refer to labels for allergen and other product information.