INGREDIENTS
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1 cup/227 grams unsalted butter (2 sticks), softened, plus more for preparing the pan
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3 cups/385 grams all-purpose flour, plus more for preparing the pan
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1 1/3 cups whole milk
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1/4 cup fresh lemon juice
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1 1/4 teaspoons baking powder
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3/4 teaspoon baking soda
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1 teaspoon kosher salt
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2 cups/403 grams granulated sugar
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4 teaspoons packed finely grated lemon zest
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4 large eggs, at room temperature
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For the buttercream:
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3/4 cup/170 grams unsalted butter (1 1/2 sticks), softened
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2 cups/246 grams confectioners’ sugar
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1 teaspoon finely grated lemon zest
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Pinch kosher salt
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4 to 5 tablespoons fresh lemon juice