INGREDIENTS
1 cup
unsalted butter, softened
1 3/4 cups
plus 2 tablespoons all-purpose flour
1/4 cup
plus 3 tablespoons confectioners sugar
2 tbsp
plus 1 teaspoon freshly grated lemon zest
1/4 tsp
salt
6
large eggs (plus 4 large egg whites)
2 1/4 cups
plus 2 tablespoons granulated sugar
3/4 cup
plus 3 tablespoons fresh lemon juice