How to Easily make a sponge cake

In this video from Gourmet Magazine we learn how to make a Génoise Cake which is a fancy French term for a Sponge cake. Soak eggs for 5 minutes in warm water. Add 6 eggs, vanilla extract and sugar to a bowl. Whisk this. Then beat for 10 minutes with an electronic mixer. Sift the flour onto a piece of parchment paper and spoon into 1 cup. Level it off. Now the mixture should be ok. Lift it and fold it on itself. Now add 1/2 teaspoon salt onto the flour. Now sift flour over mixture in thirds. Incorporate all the flour as quickly as possible. Now spoon 1/2 cup mixture into melted butter, and then add it back in to the mixture. Now put it in a parchment-lined baking pan and bake for 35 minutes. To test if it's done, look for nice golden, even color. To separate the cake from the pan, cool the cake, separate with a sharp knife.