– ½ lb. (2 cups plus 1 Tbsp.) cake flour, sifted
– ½ tsp. baking powder
– ¼ tsp. salt
– ½ lb. unsalted butter, room temperature
– ½ lb. (1 ¼ cups) superfine sugar
– ½ tsp. vanilla extract
– ½ tsp. lemon extract
– ½ tsp. almond extract
– ½ lb. eggs (about 4 large eggs plus 1 large egg white)