Preheat oven to moderate. Grease deep 23cm -round cake pan,line base with baking paper. Beat oil, sugar and eggs in small bowl with electric mixer until thick and creamy. Transfer mixture to large bowl, stir in carrot and nuts, then sifted dry ingredients. Pour mixture into prepared pan, bake in moderate oven about 1 1/4 hours Cover cake loosely with foil halfway through cooking. stand cake 5 minutes; turn onto wire rack to cool.Spread Lemon Cream Cheese Frosting over cold cake. Lemon Cream Cheese Frosting Beat butter, cream cheese and rindin small bowl with electric mixer until light and fluffy; gradually beat in icing sugar.