INGREDIENTS
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2 c. all-purpose flour
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2 tsp. baking powder
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1/4 tsp. baking soda
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1/2 tsp. kosher salt
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1/3 c. sugar
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zest from 2 largelemons
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1/2 c. cold, unsalted butter, cut into small pieces
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1/2 c. buttermilk (do not substitute)
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1 T. freshly squeezed lemon juice
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1 tsp. pure vanilla extract
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1 large egg, lightly beaten
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1 scant c. small chopped rhubarb (about 1/4" size)
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2 c. powdered sugar
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3 T. half and half
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1 tsp. pure vanilla extract
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vanilla beans scraped from half of a vanilla bean