Preheat oven to 180 C.
Melt butter, golden syrup and brown sugar in a saucepan; remove from heat.
Mix the dry ingredients together in a bowl; stir into the pot and mix thoroughly.
Press mixture into a non-stick or lightly greased 20 x 30cm slice pan; bake for 15-20 minutes.
Mark into squares while still warm.
When cool, ice with hot ginger icing: Heat all icing ingredients in saucepan until melted; beat until smooth and pour over the cool base.
When completely cold cut through icing and separate squares.
