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1.Ppreheat oven to 160°C. Grease a deep 23cm-square cake pan and line base with baking paper.
2.Sift dry ingredients into large bowl of electric mixer, add remaining ingredients. Beat mixture on low speed until ingredients are combined, then beat on medium speed until mixture is smooth and changed to a paler colour. Using metal spatula, spread mixture into prepared pan.
3.Bake cake for about 90 minutes. Cover cake loosely with foil about halfway through baking time if cake is overbrowning. Stand cake 10 minutes, turn onto wire rack, turn top-side up to cool.
4.To make lemon frosting, use a wooden spoon to beat butter and rind together in small bowl. Gradually beat in juice and icing sugar.
5.Spread cold cake with lemon frosting.