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["Preheat oven to 350*F.", "Grease 2 8"" round cake pans.", "Combine the first 5 ingredients; set aside.", "Using an electric mixer on medium-high speed, cream 10 Tbsp.", "butter, 3/4 cup granulated sugar, and 3/4 cup brown sugar until light and fluffy.", "Blend in the eggs one at a time.", "Add 1 cup heavy cream, 1/4 cup (4 T) rum, and 1 tsp.", "vanilla; blend well.", "Reduce mixer speed to medium; gradually beat in the flour mixture.", "Spread batter evenly in the prepared pans.", "Bake for 30 minutes, or until a toothpick comes out clean.", "Meanwhile, in a saucepan, heat the remaining butter, brown sugar, and rum over low heat until the butter is melted.", "With a skewer, poke holes in tops of cakes in pans; brush with 1/2 the rum mixture.", "Cool 5 minutes on racks; invert onto wire racks-bottom sides up.", "Poke holes in bottoms of cakes; brush with remaining rum syrup.", "Cool completely.", "With an electric mixer on high speed, beat the remaining heavy cream, granulated sugar, and vanilla until stiff.", "Place one cake layer on a serving platter; spread with 1 cup of the whipped cream.", "Top with the other cake layer.", "Transfer 1 cup of the whipped cream to a pastry bag fitted with a rose or star tip.", "Spread top and sides of cake with remaining whipped cream.", "Pipe rosettes on top of the cake; sprinkle each with colored sugar."]