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1
Preheat the oven to 350 degrees F (175 degrees C). Generously butter a 9 inch Bundt or tube pan. Sprinkle cinnamon sugar into the pan, and tilt to coat the buttered surface. Shake out the excess.
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2
In a medium bowl, stir together the cake flour, baking powder, baking soda and salt. Set aside.
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3
In a separate bowl, cream together 3/4 cup of butter and white sugar until light and fluffy. Beat in the eggs, one at a time, mixing well after each. Stir in the vanilla and sour cream, mixing just until blended. Gradually stir in the flour mixture until fully incorporated. Fold in the chopped pears using a rubber spatula.
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4
In a small bowl, stir together the brown sugar, cinnamon, ginger and pecans. Spoon 1/3 of the batter into the prepared pan. Sprinkle with 1/3 of the pecan mixture. Repeat layers two more times, ending with the pecan mixture on top.
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5
Bake for 50 to 60 minutes in the preheated oven, until the top of the cake springs back when lightly pressed, or a knife inserted into the crown comes out clean. Cool the cake in the pan for 15 minutes, then run a knife around the outside edge of the cake. Carefully invert onto a cooling rack. If the cake won't come out of the pan, tap it firmly with a knife on the bottom and sides of the pan. Set aside to cool completely.
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6
When cool, transfer the cake to a serving plate using two spatulas. Drizzle with the caramel ice cream topping before serving.
