Decadent Chocolate Mousse Terrine
Prep time: 45 minutes | Chill time: 6 hours (or overnight) | Servings: 8–10
Equipment
9x5-inch loaf pan
Plastic wrap or acetate collar
Electric mixer / Whisk
Ingredients
- 1. Brownie / Cake Base
- 1/2 cup (115g) Unsalted butter, melted
- 1/2 cup (100g) Granulated sugar
- 1 large Egg
- 1 tsp Vanilla extract
- 1/3 cup (35g) Unsweetened cocoa powder
- 1/4 cup (30g) All-purpose flour
- 1/4 tsp Salt
- 2. Chocolate Mousse Layer
- 8 oz (225g) Bittersweet or semi-sweet chocolate (50–70% cacao), finely chopped
- 1 1/2 cups (360ml) Heavy cream, divided
- 3 tbsp Powdered sugar
- 1 tsp Vanilla extract
- (Optional) 1 tsp Unflavored gelatin powder + 1 tbsp cold water (for extra stability)
- 3. Dark Chocolate Ganache Topping
- 4 oz (115g) Dark chocolate chips or chopped chocolate
- 1/2 cup (120ml) Heavy cream
- 4. Decoration & Garnish
- 1/2 cup Whipped cream (piped into rosettes)
- 1 cup Chocolate shavings or sprinkles (for sides)
- 7–8 Maraschino cherries with stems attached
Instructions
Step 1: Prepare the Base
Preheat your oven to 350°F (175°C) and line the bottom of a 9x5-inch loaf pan with parchment paper.
In a medium bowl, whisk together melted butter and sugar. Add the egg and vanilla extract; whisk until smooth.
Fold in the cocoa powder, flour, and salt until just combined.
Spread the batter thinly into the bottom of the prepared loaf pan.
Bake for 12–15 minutes until set. Let it cool completely in the pan.
Step 2: Make the Mousse
(If using gelatin) Sprinkle gelatin over 1 tbsp of cold water in a small cup; let bloom for 5 minutes.
In a heatproof bowl, melt the chopped chocolate with 1/2 cup of the heavy cream over a pot of simmering water (double boiler) or in 20-second microwave bursts. Stir until smooth.
(If using gelatin) Stir the bloomed gelatin into the warm chocolate mixture until completely melted and smooth. Let cool slightly to room temperature.
In a separate cold bowl, beat the remaining 1 cup of heavy cream, powdered sugar, and vanilla extract until medium peaks form.
Gently fold 1/3 of the whipped cream into the chocolate mixture to lighten it, then fold in the remaining whipped cream until smooth and uniform.
Step 3: Assemble & Chill
Line the sides of your loaf pan with plastic wrap or parchment paper (extending over the edges for easy removal).
Pour the chocolate mousse over the cooled brownie base, smoothing the top evenly with an offset spatula.
Cover lightly with plastic wrap and refrigerate for at least 6 hours (overnight is best) until fully set.
Step 4: Add Ganache & Decorate
Make the Ganache: Heat 1/2 cup heavy cream until steaming, pour over chocolate chips, let sit for 2 minutes, then stir until glossy and smooth. Let cool slightly so it is pourable but not hot.
Unmold the chilled terrine using the plastic/parchment handles onto a serving platter.
Gently press chocolate shavings along the lower sides of the dessert.
Pour the chocolate ganache over the top, letting it spread smoothly to the edges. Refrigrate for 10 minutes to set the ganache.
Pipe swirls/rosettes of whipped cream down the center line of the top surface.
Top each whipped cream rosette with a stemmed maraschino cherry.
Tip for Clean Cuts: Dip a long, sharp knife in hot water and wipe it dry before making each slice!
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