Then grease an angel food cake pan and line with parchment paper.
In a bowl, beat the eggs, yolks, sugar, zest, and a pinch of salt for 30 minutes by hand, or for 10 minutes with an electric mixer, until you get a thick, pale mixture.
Add the flour and mix until smooth.
Pour the batter in the pan and bake for 30 to 40 minutes until done. Do the toothpick test.