Because the cream in Nicaragua is thicker and slightly more acidic than the ultra-pasteurized heavy cream sold in this country, to make the cake more authentic use 1 cup of sour cream and 1 cup of heavy cream for the pint of cream specified in the recipe. Commercial marshmallow cream can be used instead of the meringue. Also, instead of unmolding the cake you can bake it in a glass pan and leave it in there.Pierce it and pour the filling over it right in the pan and refrigerate. When you're ready to serve it, put on the meringue. You will find it is easier to fill, store and the glass pan keeps the cake and filling ( which still resembles a heavy milk) very cold. Because the cake is very rich, it can serve 20.