Using a serrated knife and holding the torte firmly, cut the torte horizontally into two even layers.
Carefully pour the filling, still warm, on top of the first layer.
Place the other layer, cut side down, on top of the filling and press down gently to make it level.
Cover with plastic wrap and refrigerate overnight.
The next day, place all the frosting ingredients in a heat safe bowl and whisk until well combined.
Fill a saucepan (large enough for the mixer bowl to rest in it) with water and set it to boil. Lower the heat to a shimmer. Then, rest the bowl in the saucepan, making sure it doesn't touch the bottom. Whisk until all the sugar is dissolved and check to see if it has reached a temperature of 160-170F degrees. Remove from saucepan.
Using a hand mixer, mix until stiff peaks forms and the meringue has a glossy look, about 12 minutes.
When ready to serve the torte, cover with the meringue frosting and decorate with chopped walnuts.
Merry Christmas! :)