4 whole eggs, separated, at room temperature 3 egg whites, at room temperature 2 1/4 cups sugar, divided ¾ cup butter, at room temperature ¾ cup shortening 1 tbs pure vanilla extract ½ tsp lemon extract (optional) 3 cups cake flour (To make cake flour, replace 2 tbsp of flour with cornstarch per cup. So, for this recipe, add all the flour to a bowl, remove 6 tbsp and then add 6 tbsp of cornstarch. Whisk well to combine.) 2 tsp baking powder 1 tsp salt 1/4 tsp nutmeg (optional)
