Kärleksmums (Swedish Chocolate Cake)

Name: Kärleksmums (Swedish Chocolate Cake)
Cuisine: European
Ingredients: 100g (¼ cup + 3 tbsp) butter (melted); 3 eggs (weighing 190g in total); 150g (¾ cup) sugar; 1 tsp vanilla extract; 1 tbsp milk; 1 tbsp coffee powder; 120g (1 cup) spelt flour (see note 1); 40g (¼ cup + 2 tbsp) cocoa; 1½ tsp baking powder; 75g (¼ cup + 1 tbsp) butter (melted); 2½ tbsp cocoa; 180g (1¼ cups) icing / powdered / confectioners' sugar