1. Wash and Grate: Wash the peeled potatoes thoroughly and grate them finely.
2. Blend Dry Ingredients: In a bowl, blend together the flour, mixed spice (including raisins, if desired), salt, and nutmeg.
3. Combine with Grated Potatoes: Add the dry mixture to the grated potatoes and mix well until evenly combined.
4. Add Wet Ingredients: Incorporate the sugar, fruits, and coconut milk into the potato mixture. Stir thoroughly to ensure even distribution.
5. Prepare Baking Pan: Grease a baking pan to prevent sticking.
6. Pour and Bake: Pour the batter into the prepared pan. Bake in a preheated oven at 350°F (175°C) for 40-60 minutes, or until a toothpick inserted into the center comes out clean.