Preheat over to 350F. Prepare ingredients for the cake.
Whisk eggs together with sugar until it doubles in volume.
In a separate bowl combine flour and cacao together.
By thirds, using spatula, fold flour into the egg mixture. Be careful not to over-mix the dough.
Spread the dough into the lined baking sheet, 10" X 15" is a perfect size. Bake for 12 minutes.
Remove the cake from the oven, place a kitchen towel over the cake. Roll up the shorter side, making it into a long roll.
Let roll cool to room temperature. Remove towel and parchment paper.