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1 cup (225 grams or 8 ounces) unsalted butter, at room temperature
2 1/2 cups (500 grams) sugar
4 extra-large eggs, at room temperature
1/3 cup grated lemon zest (6 to 8 large lemons)
3 cups (390 grams) all-purpose flour
1/2 teaspoon baking powder
1/2 teaspoon baking soda
1 teaspoon (5 grams) kosher salt
3/4 cup (175 ml) plus 3 1/2 tablespoons (50 ml) freshly squeezed lemon juice
3/4 cup (175 ml) buttermilk, at room temperature
1 teaspoon (5 ml) vanilla extract
2 cups (240 grams) powdered sugar, sifted if lumpy
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