INGREDIENTS
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For the cake:
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3 cups cake flour
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1.5 tsp baking powder
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1/2 tsp baking soda
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1 tsp salt
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1 cup butter
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3 cups sugar
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5 eggs
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1/4 cup lime juice
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zest of 1 lime
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1 tsp vanilla
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3/4 cup buttermilk
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for the frosting:
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1 cup heavy cream
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4 Tbsp brown sugar
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1/2 tsp vanilla
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2 cups blackberries, divided