Sift together the 2 1/4 cups cake flour, 3/4 cup of the granulated sugar, 3 teaspoons baking powder and 1 teaspoon salt in a large mixing bowl.
In a medium sized mixing bowl or a large liquid measuring cup, beat the 6 egg yolks, 1/2 cup vegetable oil, 3/4 cup water, 3 teaspoons citrus zest and 3 teaspoons citrus extract or baking emulsion.
Add the liquid mixture to the sifted dry ingredients and beat on medium-high speed until completely smooth.
In a separate mixing bowl or bowl of a stand mixer, place the 6 egg whites and 1/2 teaspoon cream of tartar and beat the egg whites on high speed until they become foamy.
With the mixer on medium speed, slowly add in the remaining granulated sugar. Once all of the remaining sugar has been added, return the mixer to high speed and beat until the egg whites become stiff.
Using a spatula, gently fold in the egg whites in three separate additions to the batter. Pour the batter into an ungreased 10” tube pan; gently run a knife through the batter to remove any large air bubbles. Bake the cake at 325°F for 55 minutes - 1 hour, or until a toothpick inserted into the cake comes out clean.
After removing the cake from the oven, immediately run a knife around the edges of the pan. Invert the entire cake pan onto a wire rack to cool completely. Once cooled, remove from the pan and glaze the cake.