Preheat oven to 180c.
Grease and line a 20 cm (8") square baking tin with parchment paper and set aside.
In a large mixing bowl combine crushed Weetbix, self-raising flour, light brown sugar, desiccated coconut, cocoa powder, melted butter, vanilla and golden syrup, mixing well to incorporate.
65 g Weetbix breakfast biscuits, 150 g self-raising (self-rising) flour, 55 g light brown sugar, 85 g desiccated coconut, 2 tablespoon cocoa powder, 150 g salted butter, 1 teaspoon vanilla, 1 tablespoon golden syrup
Tip the mixture into the prepared baking tin.
Press down firmly to compact, then place in the oven to bake for 15 minutes.
Allow the base to cool slightly in the tin while you make the icing.
To make the chocolate icing, combine icing sugar, cocoa powder, butter and boiling water in a small bowl.
230 g icing (confectioners) sugar, 3 tablespoon cocoa powder, 30 g salted butter, 2 tablespoon boiling water
Stir well to combine then spoon icing over (baked) base and spread out evenly.
Sprinkle with extra coconut and place in the fridge to cool in the tin for at least an hour before slicing.
1 tablespoon desiccated coconut