This is a classic génoise save for the fact that 25% of its flour volume has been replaced by cocoa powder. Otherwise it’s pretty much the same. Start by preheating your oven to 375 degrees Fahrenheit and sifting together your dry ingredients: the cake flour, cocoa and salt.
OK, I decided.
Chocolate génoise is the foundation upon which a great Black Forest cake is built, and is good for a number of other things besides. Like a classic génoise it’s rather dry, but then it’s whole reason for being is to be soaked liberally with syrup.
4 tablespoons unsalted butter
3.5 ounces (3/4 cup) cake flour
0.75 ounces (1/4 cup) Dutch-process cocoa
1/2 teaspoon salt
6 eggs, room temperature
5.25 ounces (3/4 cup) sugar
1 teaspoon vanilla extract