Dark Chocolate Mousse Recipe

Prepare chocolate

Place the finely chopped Guayaquil 64% dark chocolate in a medium heatproof bowl. Set aside near your stove so you can pour hot liquid over it immediately.

Warm milk and dissolve espresso

In a small saucepan, combine the whole milk and instant espresso powder. Warm gently over medium heat until steaming but not boiling (about 150-160°F / 65-71°C). Stir to fully dissolve the espresso. Remove from heat.

Temper egg yolks

In a separate heatproof bowl, whisk the egg yolks with the granulated sugar until smooth and slightly pale. Slowly pour about 1/4 cup of the hot milk mixture into the yolks while whisking constantly to temper them. Then pour the tempered yolk mixture back into the saucepan with the remaining milk and return to very low heat, stirring constantly, until the mixture thickens slightly and coats the back of a spoon (do not boil). This should take 2–4 minutes.

Combine with chocolate

Immediately pour the hot milk-yolk mixture over the chopped chocolate. Let sit for 1 minute to soften the chocolate, then gently stir with a spatula until smooth and fully emulsified. If using, stir in the unsalted butter now for extra silkiness. Add 1/4 tsp of the kosher salt and taste, adjusting up to the full 1 tsp if desired (the mousse should have a subtle salty lift).

Cool base

Cover the bowl with plastic wrap, pressing it lightly to touch the surface of the chocolate mixture to prevent a skin. Chill in the refrigerator until the chocolate custard is cool, about 45–60 minutes. It should be thickened but still spoonable.

Whip cream and fold

While the chocolate base cools, whip 3/4 cup of the heavy cream (from the mousse ingredients) to soft peaks. Once the chocolate mixture is cool but not set, fold one-third of the whipped cream into the chocolate to loosen it, then gently fold in the remaining whipped cream in two additions until fully incorporated and airy. Do not over-fold; keep as much volume as possible.

Portion and chill

Spoon or pipe the mousse into serving glasses or bowls. Cover and chill for at least 2 hours (preferably 3–4) to set properly and develop flavor. Refrigerate up to 48 hours.

Chill a mixing bowl and beaters in the freezer for 10 minutes before whipping. Pour the chilled heavy cream, powdered sugar, cooled espresso (or strong coffee), and vanilla extract into the chilled bowl. Whip on medium-high speed until soft to medium peaks form — the cream should hold shape but still be smooth and slightly cloud-like. Taste and adjust sweetness. Keep chilled until ready to use.

When mousse has set, pipe or dollop the Coffee Chantilly onto each serving. Use a small offset spatula or spoon to create a pretty swirl.

Sprinkle a small pinch (about 1/16 to 1/8 tsp) of flaky sea salt over each mousse to enhance the chocolate flavor. Add chocolate shavings or a light dusting of cocoa powder if desired. Add extra whipped cream or berries as garnish if using.

Serve chilled. Each serving is rich: recommend small portions (see servings). Leftovers can be covered and refrigerated for up to 2 days; chantilly is best used the same day.