Heat oven to 160 degrees C fan bake. Grease a 17cm x 27cm slice tin with butter. Place butter and sugar in a bowl and beat with an electric mixer until pale and creamy.
Sift flour, baking powder and ginger over the creamed mixture, then stir to combine. Press into the base of the prepared tin. Bake for 25 to 30 minutes then remove to cool.
For the topping, place the butter, icing sugar, golden syrup and ginger in a saucepan over a medium heat until the butter melts. Bring to the boil for one minute.
Pour topping over cooked base and scatter with chopped macadamias (lightly toasted). Cut into squares while still warm.
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