Mousse Au Chocolate Recipe

Prepare chocolate

Place the chopped Valrhona dark chocolate in a heatproof bowl and set aside.

Heat milk

In a small saucepan, heat the whole milk until it just begins to steam and small bubbles form at the edges (do not boil). Remove from heat.

Temper chocolate

Pour about one-third of the hot milk over the chopped chocolate. Let sit for 30 seconds, then stir gently until smooth and glossy. Add the remaining milk if needed to fully melt and smooth the chocolate. Stir in the softened butter and the sea salt until incorporated. Set the chocolate mixture aside to cool slightly (to about 40–45°C / warm to the touch).

Whisk egg yolks and sugar

In a heatproof bowl, whisk together the egg yolks and granulated sugar until pale and slightly thickened.

Make a light sabayon

Place the egg yolk-sugar bowl over a double boiler (simmering water, bowl not touching water) and whisk continuously until the mixture reaches about 65°C, becomes thick and ribboning (about 5–7 minutes). Remove from heat and continue whisking 30 seconds to cool slightly.

Combine yolks with chocolate

Fold about one-third of the warm chocolate into the yolk sabayon to lighten it, then gently fold the sabayon back into the remainder of the chocolate until fully combined and smooth. Cool to lukewarm (about 30–35°C).

Whip cream and fold

Whip the 240 ml cold heavy cream to soft peaks. Reserve about 2 tablespoons of whipped cream if you want a decorative peak later. Gently fold one-third of the whipped cream into the chocolate mixture to loosen it, then fold in the remaining whipped cream in two additions until homogeneous and airy. Do not over-fold; stop when the mousse is smooth with soft peaks.

Chill

Portion the mousse into serving glasses or a bowl. Cover and refrigerate for at least 2 hours (preferably 3–4 hours) until set but still light.

Chill a mixing bowl and beaters in the freezer for 10 minutes. Pour the very cold 200 ml heavy cream into the chilled bowl. Add powdered sugar and vanilla extract. Whip to medium–firm peaks (soft enough to pipe but holding shape). Keep refrigerated until assembly. If you reserved a small amount of whipped cream from mousse step, incorporate that gently with this chantilly or use separately for topping.

Toast hazelnuts

If not already toasted, spread hazelnuts on a baking sheet and toast at 180°C (350°F) for 8–10 minutes until aromatic and skin blisters. Rub nuts in a clean towel to remove loose skins. Allow to cool slightly.

Make caramel

In a medium heavy-bottomed saucepan, combine the granulated sugar and water over medium heat. Without stirring, swirl the pan occasionally until the sugar dissolves and turns a deep amber color (watch closely to avoid burning).

Combine nuts and caramel

Quickly add the toasted hazelnuts to the caramel, stir to coat evenly, then pour the hot praline onto a parchment-lined sheet. Spread thinly and allow to cool and harden.

Process praline

When cool, break the praline into pieces and pulse in a food processor until it becomes a coarse crunchy paste (praline). Add the optional 5 g oil or butter at the end for a slightly smoother texture. Reserve about 1 tablespoon (15 g) of finely chopped praline for garnish and the rest to fold or sprinkle into the mousse if desired.

Place the finely chopped white chocolate in a bowl. Heat the 60 ml heavy cream until just simmering, then pour over the white chocolate. Let sit 30–60 seconds, then stir gently until smooth. Add the 10 g softened butter and stir until glossy. Allow ganache to cool to a thick but pourable consistency (room temperature or slightly warm).

When mousse has set, spoon or pipe a layer of chantilly cream (about 1–1.5 tablespoons) onto each mousse portion, leaving space for other elements.

Spoon or drizzle a small amount (about 1 tablespoon) of the white chocolate ganache over the chantilly or slightly off-center on the mousse for contrast. You can thin the ganache slightly with a few drops of warm cream if it becomes too stiff.

Sprinkle a teaspoon of chopped hazelnut praline over the ganache and another teaspoon of cacao nibs for texture and crunch. Garnish with a small mint leaf if desired.

Serve chilled. For best texture, allow plated portions to sit 3–5 minutes at room temperature before eating so the ganache softens slightly.