Fudge Frosting
Have all ingredients at room temperature. Combine butter, sugar, eggs, sifted dry ingredients & milk in large basin of electric mixer, beat on low speed until ingredients are combined, increase speed to medium, beat for about 3 minutes or until mixture becomes lighter in colour & smoother in texture. Spread mixture evenly into well greased lamington tin, bake in moderate oven 30 minutes. Stand few minutes before turning onto wire rack to cool. When cold, top with Fudge Frosting.
Melt chocolate & butter over hot water, stir in sifted icing sugar & enough milk to give thick spreading consistency.