This is my absolute favorite dessert. It is a tradition in the Mehltretter family instead of birthday cake. Make sure you make it the day before you need it. It is easy, but it takes a long time to cook/dry/cool.

Chocolate Torte Royale
You make it in two parts, the shell and the filling. The shell calls
for egg whites, but save the yolks for the filling or you will double
your egg use. Preheat oven to 275 degrees. I don't recommend starting
this recipe at 11pm, as you leave it in the oven for 3 hours. You also
chill it for a few hours before serving, so it is best to make it the
day before it is served.
Meringue Shell:
2 egg whites
1/4 tsp of salt
1/2 tsp of vinegar
then
1/2 cup of sugar
1/4 tsp of cinnamon
First, you have to make a cooking surface. Cut out a paper grocery bag
or some heavy brown postal paper to cover a pizza pan or cookie sheet.
The recipe says draw an 8 inch circle on the paper. I make my shell in
about a 10 inch circle because I like it more on the thin side, and
then it also feeds more people.
Then, assemble the egg whites, salt and vinegar in a mixing bowl and
use an electric mixer, beating it until soft peaks form. Gradually
blend in sugar and cinnamon and mix it until hard peaks form and the
sugar is dissolved.
You then spread this mixture around the circle, thinner on the bottom
and mounded around the edges. You can use a teaspoon to make the edges
have ridges - I just use a spatula.
Bake for one hour and then leave in the oven after you turn the heat
off for another two hours so it will dry out completely.
Twin Cream Fillings:
1 cup semisweet chocolate chips
2 egg yolks
1/4 cup water
1 cup heavy whipping cream
1/4 cup sugar
1/4 tsp cinnamon
Melt 1 cup of semi sweet chocolate chips (6 oz) - I do this in the
microwave, but don't overcook. Try a minute at a time and let it stand
in between if you are not confident about the time.
Cool slightly and spread about two tablespoons of the straight
chocolate over the bottom of the cooled meringue shell. This is layer
one.
Then, add to the remaining chocolate the two egg yolks and the 1/4 cup
of water and blend them. Let this chill until it thickens.
Meanwhile, combine the 1 cup of heavy cream with the 1/4 cup sugar and
1/4 tsp of cinnamon, and whip until stiff. Spread half of this over
the chocolate - this is layer two. The remaining half of the sugared
cream is then mixed into the chocolate and spread on top to make layer
three.
Chill the torte for a few hours or overnight before serving. Do not
worry about leftovers, you won't have any.
Unfortunately, his recipe does not work quite as well in hot climates
with no a/c and limited power for the fridge.