Preheat the oven to 180°C/160°C fan/gas mark 4.
Plan the Fate Low Protein All-Purpose Mix and the butter in a bowl and rub between your fingertips to a breadcrumb consistency.
Add the sultanas, brown sugar and mixed spice and combine.
Pour in the ProZero and mix with a spatula until a wet dough forms.
Spoon the dough into a lined cake tin and bake in the oven for 1 hour or until golden.
Fate Low Protein All-Purpose Mix and ProZero are foods 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.