1.Preheat oven to 160°C. Grease a 23cm square slab pan, line base with paper; grease paper.
2.Cream butter and sugar in small bowl with electric mixer until light and fluffy; beat in eggs one at a time, beat until combined. Transfer mixture to large bowl, fold in sifted dry ingredients, peel and sour cream, stir until mixture is smooth.
3.Pour mixture into prepared pan, bake about 1¼ hours. Stand 5 minutes before turning on to wire rack to cool.
4.To make lemon icing, sift icing sugar into small heatproof bowl, stir in butter and enough lemon juice to make a stiff paste. Stir over hot water until icing is spreadable.
5.Top cold cake with icing, sprinkle cake with cinnamon.
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