Bring the whiskey and the 3/4 cup cream to a boil. Remove from heat and add the gelatin leaves.
Pour into a mixing bowl with the chestnut puree. Mix with a "La Feuille" (a paddle mixer). Mix until the mixture cools down. Fold the whipped cream into the chestnut whiskey mixture with a spatula, forming a mousse. Reserve in a plastic pastry bag.
Chocolate and Walnut Biscuit
Preheat oven to 350 F.
In a bowl mix the yolks and 12.5 oz. sugar to a ribbon. With a spatula fold in cocoa and chopped walnuts. Mix well. In a separate bowl whip egg whites with the 8 ounces of sugar, firm but not stiff. Fold egg whites into the yolk/sugar mixture. Bake on a sheet pan on parchment or silpad for 20 to 30 minutes.
Syrup for Biscuit
Bring water and sugar to a boil. Remove from heat. Add whiskey (no heat).
Spiced Chocolate Sorbet
Bring the water and the sugar to a boil in a large, stainless steel pot. Add the cocoa powder and whisk until smooth. Add the chopped chocolate, honey, bourbon, pepper, and espelette.
Turn in sorbet or ice cream machine.
Soak gelatin sheets in ice water. Bring water and sugar to a boil. Slowly wisk in cocoa powder, then the cream. Bring to a boil. Strain mixture of any lumps and cool down to 144 degrees F.
Remove gelatin sheets from water, squeeze dry, and then mix into chocolate. Cool down completely.
Assembly of Dessert:
Cut 12, 1 1/2 and 3 inch discs out of the chocolate and walnut biscuit.
Using 12 silicone dome molds, take the mousse and fill each mold a quarter of the way up.
Take the 1 1/2 inch disc and put it into the mold, pressing it into the mousse until level with it.
Take the mousse and fill the molds, filling till 1/2 inch from the top of the mold.
Brush the discs heavily with the whiskey syrup. Set aside.
Fully melt chocolate glaze inside of a pourable container. Cool down till chocolate is at room temperature or cool to the touch. Place completely frozen chocolate mousses on a wire rack.
Slowly pour chocolate over each bomb till thoroughly coated. Put onto a sheet tray and refrigerate for an hour.
Plating of Dessert:
Brush some melted chocolate glaze onto a circular plate going from ten o clock to two o clock.
Take the 3 inch disc and press it into the mold. Should be level with the mold.
Freeze for 4 to 5 hours or until completely frozen.
Place the chocolate mousse at ten o clock on the plate and the wedge opposite it at two o clock.
Take one finished chocolate mousse and cut a wedge out of it.
Take a quenelle of chocolate sorbet and place it at four o clock on the plate.