INGREDIENTS
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1 1/3 c. unsalted butter, softened, plus more for the pans
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4 c. cake flour, plus more for the pans
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1 1/3 cups whole milk
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2 tsp. pure vanilla extract
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4 tsp. baking powder
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1 tsp. fine salt
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2 2/3 c. granulated sugar
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7 large egg whites, at room temperature
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1 c. sweetened flaked coconut, packed
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2/3 c. store-bought lemon curd (such as Dickinson's)
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1/4 c. sour cream
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1 tbsp. lemon zest
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8 oz. mascarpone cheese
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1 1/2 c. heavy cream
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2 tsp. coconut extract
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1/3 c. granulated sugar