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1
Preheat an oven to 350u00b0F. Generously grease a 12-cup Bundt pan with butter. Sprinkle the brown sugar in the bottom of the pan, then evenly distribute the cranberries over the sugar.
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2
In a bowl, whisk together the flour, baking powder, baking soda and salt. Add the granulated sugar to the bowl of a stand mixer. Finely grate the zest from the lemons over the sugar and mix briefly.
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3
Squeeze the juice from the lemons. In a liquid measuring cup, combine 2 Tbs. of the lemon juice, the buttermilk and vanilla; reserve the remaining lemon juice.
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4
Add the 12 Tbs. butter to the lemon zest-sugar mixture and beat on medium-high speed until light and fluffy, 1 to 2 minutes. Beat in the eggs, 1 at a time, scraping the sides of the bowl after each addition. Reduce the mixer speed to low and add the dry ingredients in 3 batches, alternating with the buttermilk mixture in 2 batches. Raise the mixer speed to medium-high and beat for 2 minutes to aerate.
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5
Scrape the batter into the prepared pan and spread it evenly over the cranberries. Bake until the cake is browned and a cake tester inserted into the center comes out clean, 35 to 40 minutes OR LESS. Let cool in the pan for 5 minutes, then invert the cake onto a cake plate, lift off the pan and let cool completely.
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6
Once the cake is cool, in a bowl, whisk together the confectioners' sugar and 1 1/2 Tbs. of the reserved lemon juice until thick and smooth. Test the consistency by drizzling a bit of glaze over the cake. If it runs off the cake, whisk in a little more confectioners' sugar; if it sits on the cake without moving, whisk in a little more lemon juice. Drizzle the glaze over the cake and let set for at least 15 minutes. Slice into wedges and serve.
