Stir well and distribute the resulting dough in an oven dish that's been laid out with baking paper and slightly oiled. Bake the layer about 20-30 min. until a toothpick comes out dry when you poke it.
Once it's ready, take it out onto a cooking grid and once it cools well, divide it into 2 parts. It's best to leave them like this overnight before using them to assemble the cake.
To prepare the cream, melt the dark chocolate in a water bath. Then add the butter and liquid chocolate to it. Beat well with a mixer and add the crumbled wafers to the resulting cream.
Put the first layer in a platter and cover it with the cream. Position the second layer on top. Leave the cake aside, while you make the ganache.
Mix the ingredients for it in a deep container and heat it in a water bath. Then pour it over the assembled cake. Decorate with the bonbons and put it in the fridge for a few hours.
Note: Before serving this unique chocolate cake, it's best to leave it at room temperature for about an hour.