Milk and vegetable oil add moisture to this sponge cake gently flavored with cocoa. I like to serve this cake with whipped cream. For the whipped cream, Confectioners’ sugar is preferred to granulated sugar because the small amount of cornstarch in the former discourages the weeping that occurs when whipped cream stands for longer than a few hours. A hint of vanilla is imperative. Learn to distinguish between the stages of whipped cream; it doesn’t always have to be stiff. As a garnish for a dessert, the goal is softly beaten Schlagsahne that barely mounds. When used for piping, cream should be whipped to the stiff stage. Of course there is an in between stage, too, used for when the cream is the base for a torte filling. Take care not to over whip the cream, at which point it has a coarse, grainy texture and is well on its way to becoming butter.