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Grease 10-cup classic or fancy bundt or tube pan; dust with flour. Set aside.
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In large bowl, beat butter with sugar until fluffy; beat in eggs, 1 at a time, beating well after each. Beat in orange rind and vanilla.
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In separate bowl, whisk together flour, baking powder, baking soda and salt. Stir into butter mixture alternatively with sour cream, making 3 additions of dry ingredients and 2 of sour cream. Fold in carrots. Scrape into prepared pan; tap pan on counter and smooth top.
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Bake in centre of 325F oven until cake tester inserted in centre comes out clean, about 1 hour. Let cool in pan on rack for 10 minutes. Remove from pan to rack; let cool completely.
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Glaze: in small bowl, mix icing sugar with orange juice until smooth; brush over cake.
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Garnish with chocolate curls and candied orange rind.