Prepare the batter: Whip egg whites with sugar using an electric whisk. Add egg yolks by hand. Sift flour, cocoa, and yeast and fold into the mixture. Add oil and mix well.
Bake the cake: Pour the batter into a pan and bake until cooked. When hot, immediately turn out and cover with cling film.
Prepare biscuit discs: Carve three discs from the cake, joining scraps to form one disc.
Line molds: Use the larger biscuit disc to line the zuccotto and chalkboard molds.
Cook cherries: Cook cherries with sugar and liqueur until softened.
Prepare filling: Whip cream, mascarpone, and sugar until golden. Add cooked cherries to half of the filling.
Assemble zuccotto: Use half of the filling for the first layer. Place the smaller biscuit disc on top, wet it, add the remaining filling, seal, and refrigerate.
Finish and decorate: After resting, turn the zuccotto out onto a plate. Glaze with the cream and mascarpone mixture. Decorate with chocolate curls, piped tufts, and cherries.