For the Raffaello cake, mix the yogurt and sugar together. Prepare the gelatin according to package directions and mix into this mixture. Whip the whipped cream until stiff and fold into the yogurt mixture.
Slice the sponge and spread the cream in an even layer. instroke. Place the second part of the sponge on top and spread the cream on it as well. Spread the cream all around the cake, sprinkle with coconut and decorate with raffaello.
Chill the Raffaello cake well in the refrigerator.