Cool the sponge rolls that we prepared for a while, and transfer them into a bowl.
Crumble the cake to make your work easier.
Blend it with milk (1/4 cup), and melted dark chocolate (1/4 cup). You can use warm black-coffee instead of dark chocolate if you prefer.
Use your hand to mix these, so that you can get a dough-like consistency. You can then add a little more milk if needed.
Take a rectangular-shaped buttered sheet, and spread the cake-dough on that equally.
Fill it with the fresh cream we made.
Roll it gently to make it as a roll cake (as you know), and pour the chocolate glaze on it. Make sure that the full part is covered.
Freeze the roll until the coating gets firm.
Once the glaze coating is set, take that out, and sprinkle the sweetener we made.
Decorate the cake with cherries or strawberries to give it an awesome look, and enjoy a delicious dessert.