1.Preheat the oven to 170°C (150°C fan- forced). Grease an 18cm x 27cm slice pan (inside top measurement). Line the base and sides with baking paper, extending the paper 3cm over the sides.
2.Place butter, raisins and rum in saucepan; stir over low heat until butter is melted.
3.Meanwhile, combine the sugar, flour and coconut in a large bowl. Stir in the butter mixture until combined. Press the mixture evenly into the pan.
4.Bake the slice for 20 minutes or until browned. Cool in pan.
5.Meanwhile, to make the topping; sift icing sugar and cocoa into a medium bowl. Stir in remaining ingredients until combined.
6.Spread topping over cooled slice; sprinkle with flaked coconut. Stand until set. Lift slice onto a board; cut into pieces
Suitable to freeze without the topping. Butter mixture suitable to microwave.Note