Gluten-free Christmas cake

3 large or 4 smaller clementines, mandarins or satsumas

225g butter at room temp

150g raisins

75g currants

110g real glacé cherries

2 tbsp whiskey or brandy

225g soft dark brown sugar

3 eggs

1 tsp mixed spice

small pinch ground cloves

150g ground almonds

110g polenta or cornmeal

1 tsp gluten-free baking powder

For the icing:

225g marzipan

340g gluten-free icing sugar

2 tbsp water

diamonds of candied peel

dried cranberries

toasted almonds