Pre-heat the oven to 175C fan-forced and grease and line a 15x25cm shallow pan.
In the bowl of an electric mixer, beat the butter and sugar together until light and creamy.
Add the dry ingredients and mix to combine.
Press the mixture into the tin.
Bake for 15-20 minutes or until it starts to turn golden.
Leave to cool in the tin.
Meanwhile, make the icing.
Place the icing sugar, butter, ginger and golden syrup in a small saucepan and heat, stirring, until the sugar has dissolved and the mixture is smooth.
Pour over the base and leave to set.
Cut the slice into squares to serve.