Coconut mocha slice

Ingredients

• 125 gram butter, melted
• 3/4 cup brown sugar
• 1 egg, lightly beaten
• 1/2 cup plain flour
• 1/4 cup self-raising flour
• 2 tablespoon cocoa powder, plus extra, for dusting
• 1 cup desiccated coconut
• cocoa, grated chocolate, to serve
• Icing
• 2 teaspoon instant coffee
• 1 teaspoon warm water
• 1 1/2 cup icing sugar mixture, sifted
• 1 teaspoon butter
• 1 tablespoon hot water