Preheat oven to 180c / gas 4
Prepare a 20cm square tin
175 g gluten free self-raising flour
175 g butter
160 g demerara sugar
4 eggs (3 if not using gf flour)
Rind of 1 lemon
1 1/2 tsps gf baking powder
Topping – juice of the lemon and 150g sugar
Put all the ingredients for the cake in to a bowl and mix well until smooth.
Turn mixture in to prepared tin.
Bake for about 35 mins – until skewer is clean.
Whilst the cake is still hot spoon the lemon/sugar mixture all over the top of the cake. Once cool remove the cake from the tin.