Chocolate Swiss Roll

Carefully unroll the cooled sponge cake and spread the chocolate ganache evenly over the entire surface.
Roll the sponge cake again, gently squeezing it to form a roll.
Place the cake in the refrigerator for at least 1 hour so that the ganache sets well.
Decoration and serving:
Sprinkle with icing sugar or decorate with chocolate shavings for an elegant presentation.
Slice the roll and serve chilled, possibly accompanied by a scoop of ice cream or custard