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1
Preheat oven to 350u00b0. Line bottoms of two greased 8-in. round baking pans with parchment paper; grease paper.
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2
In a large bowl, beat butter and sugar until crumbly. Add eggs, one at a time, beating well after each addition. Beat in vanilla. In another bowl, whisk flour, baking cocoa, salt, baking soda and baking powder; add to creamed mixture alternately with water, beating well after each addition.
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3
Transfer batter to prepared pans. Bake 25-30 minutes or until a toothpick inserted in center comes out clean. Cool in pans 10 minutes before removing to wire racks; remove paper. Cool completely.
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4
In a chilled large bowl, beat cream until it begins to thicken. Add confectioners' sugar; beat until soft peaks form. Refrigerate, covered, 1 hour or until very cold.
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5
For filling, in a small saucepan, sprinkle gelatin over orange juice concentrate; let stand 1 minute. Stir in sugar. Heat and stir over low heat until gelatin is completely dissolved. Stir in 1/4 cup Grand Marnier and orange zest. Let filling stand at room temperature just until spreadable, stirring occasionally. (If mixture becomes too firm, warm in microwave to soften, about 10-15 seconds.)
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6
Meanwhile, using a long serrated knife, cut each cake horizontally in half. Brush layers with remaining Grand Marnier. Place one cake layer on a serving plate; spread with one-third of the filling. Repeat twice. Top with remaining cake layer.
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7
To frost cake, cut a hole in the tip of a pastry bag or in a corner of a food-safe plastic bag and insert #829 or other large star pastry tip. Gently stir whipped cream; spoon into bag and pipe onto top and sides of cake. Refrigerate at least 4 hours before serving.
