INGREDIENTS
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1 box vanilla cake, plus ingredients called for on box
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Juice and zest of 1 1/2 lemons, divided, plus more zest for garnish
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1 3/4 c. fresh blueberries
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3 tbsp. all-purpose flour
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1 c. (2 sticks) butter, softened
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2 1/2 c. powdered sugar
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1/4 c. heavy cream
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1 tsp. vanilla extract
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pinch of kosher salt
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2 thin lemon slices, for topping
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