Chocolate orange crown cake. Shell is biscuit. Not the kind you put butter on. French biscuit is a butter free sponge cake sturdy enough to pipe with pastry bag. Structure comes from separated eggs and whites beaten to billows.
Inside shell is orange Bavarian cream, a rich custard of milk and egg yolk thickened with whipped cream and unflavored gelatin. Flavored with orange concentrate (fresh squeezed orange juice cooked down to 1/4 the volume), orange zest, and hefty amount of Grand Marnier. On top of that is a layer of lightly whipped chocolate ganache. Then the lid. Served with creme anglaise, pouring custard of egg yolk, cream, Grand Marnier. And with thin slivers of orange zest poached in syrup.