Lamingtons (Ystervarkies)

Name: Lamingtons (Ystervarkies)
Prep time: 40 min
Cook time: 35 min
Total time: 1 h 15 min
Cuisine: Australian, African
Ingredients: 125 grams butter ((softened)); 220 grams white granulated sugar ((caster/granulated)); 2 eggs ((large)); 225 grams plain flour ((all-purpose/standard grade)); 3 tsp baking powder; ½ tsp table salt; 250 ml milk; 1 tsp vanilla extract; 500 grams icing sugar ((sifted or whisked through to break up lumps)); 30 grams unsweetened cocoa powder ((Dutch-processed)); 15 grams butter; 125 ml boiling water; 2-3 cups dessicated coconut