INGREDIENTS :
FOR THE CAKE:
2 1/2 cups cake flour
1 Tablespoon baking powder
1/2 teaspoon salt
1 1/4 cups buttermilk
4 large egg whites
1 1/2 cups granulated white sugar
2 teaspoons freshly grated lemon zest
1/2 cup (1 stick) unsalted butter, at room temperature
1/2 teaspoon pure lemon extract
FOR THE BUTTERCREAM:
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