Stir in the flour, ground rice/almonds, xanthan gum, baking powder and walnuts
8 Pour into the cake tin and bake for 45 minutes
9 Remove from the oven and cake tin
10 Allow to cool completely
11 Make the coffee buttercream by beating together the icing sugar and dairy free spread until light and fluffy
12 Mix together the coffee and boiling water
13 Stir through the buttercream
14 Cut the cake in half and use 3/4 of the buttercream to sandwich the two halves together
15 Use the remaining buttercream to ice the top of the cake
16 Decorate with walnuts