A rich, airy chocolate sponge topped with a silky raspberry mousse — this cake balances bitter dark chocolate with bright tart berries for a dessert that feels fancy but is surprisingly approachable. It’s the kind of centerpiece you can make for a dinner party, holiday table, or a special weekend treat when you want something impressive without a pastry-degree level of fuss. If you love chocolate-forward desserts, this slice plays really well alongside other homemade bakes — and if you ever need a rustic counterpoint for a brunch spread, try pairing a slice with a tray of warm Best Chocolate Chip Cookies for a chocoholic dream.
Why you’ll love this dish
This cake gives you three irresistible textures: a tender, slightly fudgy chocolate sponge, a light whipped raspberry mousse, and a satisfyingly glossy top finished with chocolate shavings and fresh berries. It reads as elegant on the plate but uses straightforward techniques — whisking, folding, blooming gelatin, and chilling — that home bakers can master.
“Perfect balance of chocolate and berry — my guests thought it was from a pâtisserie.” — a home cook’s quick review
Perfect occasions: festive dinners, Valentine’s Day, birthdays, or make-ahead desserts for entertaining. It’s also ideal when you want a showpiece you can assemble ahead and refrigerate so the day-of is calm.
How this recipe comes together
A quick rundown before you start so the steps make sense:
- Bake a single-layer chocolate sponge in a 20 cm (8-inch) pan and cool completely.
- Cook and purée raspberries; bloom powdered gelatine in lemon juice and dissolve it into the warm purée to set the mousse.
- Whip cold double cream to soft-medium peaks, fold into the cooled raspberry base, then fold in some whole raspberries for texture.
- Pour the mousse onto the sponge inside a cake ring or springform, chill until set, and finish with chocolate shavings and extra berries.
Knowing this sequence helps you prep tasks in parallel (bake while the purée cools; whip cream right before folding).
What you’ll need
Chocolate Sponge
- 3 large eggs (room temperature)
- 55 g light brown sugar
- 65 g granulated sugar
- 1 tsp vanilla extract
- 65 g plain flour (all-purpose)
- 15 g cocoa powder
- 1 tsp baking powder
- ½ tsp espresso powder (optional — deepens chocolate flavor)
- ¼ tsp salt
- 75 g dark chocolate 75%, melted and cooled
Raspberry Mousse
- 2¼ tsp powdered gelatine
- 45 ml fresh lemon juice
- 400 g fresh raspberries (or frozen — see notes below)
- 100 g granulated sugar
- 480 ml double cream (heavy cream) (cold)
- 125 g fresh raspberries (reserved to fold into the mousse)
To serve
- 50 g dark chocolate shavings
- Extra fresh raspberries
Notes and substitutions:
- Frozen raspberries work well — thaw, heat briefly with sugar to break down excess water, and strain if you want a seed-free purée.
- If you need a vegetarian alternative to gelatine, use a commercial agar/vegetarian gelling agent and follow the manufacturer’s instructions (behavior differs from gelatine).
- Use an 8-inch (20 cm) springform or a loose-bottom cake ring for easier assembly and removal.
Step-by-step instructions
Preheat and prepare:
- Preheat oven to 180°C (350°F). Line the base of a 20 cm (8-inch) springform pan with parchment and lightly grease the sides.
Make the chocolate sponge:
- In a large bowl, whisk the 3 eggs, light brown sugar and granulated sugar, and vanilla extract together. Beat on high for 6–8 minutes (hand or stand mixer) until thick, pale, and ribboning when the whisk is lifted.
- Sift together the plain flour, cocoa powder, baking powder, espresso powder and salt. Fold the dry mix gently into the egg mixture in two additions, keeping as much air as possible.
- Fold in the cooled melted dark chocolate until just combined. Avoid over-mixing.
- Pour into prepared pan, smooth the top, and bake for 20–25 minutes until the top springs back slightly and a skewer comes out with a few moist crumbs (not wet batter).
- Cool completely in the tin on a wire rack. Once cool, remove from pan and, if needed, level the top so the sponge sits flat.
Prepare the raspberry purée and gelatine:
- Place 400 g raspberries and 100 g sugar in a saucepan with the 45 ml lemon juice. Warm gently and stir until the sugar dissolves and berries begin to break down (3–5 minutes). Remove from heat.
- Strain if you want a seed-free mousse (optional). Measure the purée consistency; you want it warm but not piping hot.
- Sprinkle the 2¼ tsp powdered gelatine evenly over a few tablespoons of cold water or directly over the lemon juice (as the recipe lists 45 ml lemon juice, you can bloom the gelatine in that). Let bloom 3–5 minutes, then stir into a small amount of the warm purée to dissolve fully, then mix back into the rest of the purée. Ensure the gelatine is completely dissolved.
Whip the cream and assemble mousse:
- Whip the 480 ml cold double cream to soft–medium peaks. Stop when the cream holds a soft peak but is still glossy.
- Cool the raspberry + gelatine mixture until it is slightly thickened and just lukewarm (not setting solid). Fold one-third of the whipped cream into the purée to lighten it, then fold in the remaining cream gently until homogenous.
- Gently fold in the reserved 125 g fresh raspberries (whole or halved).
Build the cake and chill:
- Place the cooled sponge in an 8-inch cake ring or the springform base (you can assemble inside the springform). If the sponge does not fit neatly, trim to size.
- Pour the mousse over the sponge, smooth the top, and tap the pan gently to release air bubbles.
- Refrigerate for at least 4–6 hours, preferably overnight, until fully set.
Finish and serve:
- Once set, remove the ring or release the springform. Decorate with 50 g dark chocolate shavings and extra raspberries before serving.
- For neat slices, chill the cake well and wipe a hot knife clean between cuts.
Best ways to enjoy it
Serve chilled in thin slices so each portion keeps the mousse-to-sponge ratio balanced. Pair with:
- A shot of espresso or a robust black coffee to cut through the richness.
- A light scoop of vanilla ice cream or a drizzle of crème anglaise for extra indulgence.
- If you’re building a brunch or dessert table, this cake sits beautifully next to fruit pancakes or light pastries — try a stack of warm fluffy flapjacks for a contrasting warm/cold dessert pairing.
Storage and reheating tips
- Refrigeration: Store covered in the refrigerator for up to 3–4 days. Keep away from strong odors; wrap the cake or use an airtight cake carrier.
- Freezing: You can freeze the whole cake (firmly wrapped in plastic and foil) for up to 1 month for best quality. Thaw overnight in the fridge before serving. Note: raspberries may soften slightly after freezing.
- Slicing: For clean slices, chill the cake thoroughly and wipe a hot, dry knife between cuts. Running the knife under hot water, drying it, then slicing works well.
- Food safety: Because the sponge is fully baked and the mousse uses cooked fruit with gelatine (no raw eggs), it’s safe refrigerated. Always keep refrigerated and discard after the recommended storage time.
Pro chef tips
- Room-temperature eggs whip to greater volume; remove them from the fridge 30 minutes before starting.
- When beating eggs and sugars, aim for the ribbon stage — the batter should fall in ribbons and hold shape briefly. This gives the sponge lift without extra leavening.
- Bloom gelatine properly: sprinkle powder over cold liquid, let it sit a few minutes, then dissolve it in a warm (not boiling) portion of the purée. Boiling will destroy gelation power.
- Chill the purée until lukewarm before folding in cream — if it’s too warm, it will deflate the cream or prevent the mousse from setting.
- To avoid a seed-filled mousse, press the purée through a fine-mesh sieve, but save the strained seeds for compote or garnish.
- If using frozen raspberries, warm them with sugar to loosen juices, then reduce slightly to concentrate flavor and avoid a watery mousse.
Creative twists
- Liqueur boost: fold 1–2 tbsp of Chambord or raspberry liqueur into the purée before adding gelatine for a deeper flavor.
- White chocolate version: mix melted white chocolate into the whipped cream for a white chocolate-raspberry mousse layer.
- Gluten-free: replace plain flour with a 1:1 gluten-free flour blend that contains xanthan gum; keep other ratios the same.
- Mini entremets: make in individual mousse rings or silicone molds for elegant single-serve portions.
- No-gelatine option: use a vegetarian gelling agent per package instructions; note textures differ slightly from gelatine-set mousse.
Common questions
Q: Can I use frozen raspberries instead of fresh?
A: Yes. Thaw them and heat gently with the sugar to break down and reduce excess water. Strain for a seed-free purée if you prefer a smooth mousse. Using frozen fruit may add a little extra water, so simmer briefly to concentrate flavor.
Q: How long does this take from start to finish?
A: Active hands-on time is about 60–75 minutes (including baking and preparing the mousse). The mousse needs at least 4–6 hours to set, but overnight chilling yields the best texture.
Q: Can I make the cake a day ahead?
A: Absolutely. It’s ideal to make it the day before serving — this gives the mousse time to set firmly and the flavors to meld. Store covered in the refrigerator.
Q: What can I use instead of powdered gelatine?
A: For vegetarian options, use a commercial agar-agar or vegan gelling agent, but follow the manufacturer’s instructions carefully — agar sets differently and often requires boiling. Results will vary, so test a small batch if you haven’t used it before.
Q: How do I get neat slices?
A: Chill the cake well before slicing. Heat a large knife under hot water, dry it, and make decisive cuts, wiping the blade after each slice.
If you want a printable shopping list or timing schedule to make this the day-of, I can format one for you.
Chocolate Raspberry Mousse Cake
Ingredients
Chocolate Sponge
- 3 large eggs (room temperature)
- 55 g light brown sugar
- 65 g granulated sugar
- 1 tsp vanilla extract
- 65 g plain flour (all-purpose)
- 15 g cocoa powder
- 1 tsp baking powder
- 0.5 tsp espresso powder (optional) Deepens chocolate flavor
- 0.25 tsp salt
- 75 g dark chocolate 75%, melted and cooled
Raspberry Mousse
- 2.25 tsp powdered gelatine
- 45 ml fresh lemon juice
- 400 g fresh raspberries (or frozen)
- 100 g granulated sugar
- 480 ml double cream (heavy cream) (cold)
- 125 g fresh raspberries (reserved to fold into the mousse)
To Serve
- 50 g dark chocolate shavings
- extra fresh raspberries
Instructions
Preheat and Prepare
- Preheat oven to 180°C (350°F). Line the base of a 20 cm (8-inch) springform pan with parchment and lightly grease the sides.
Make the Chocolate Sponge
- In a large bowl, whisk the 3 eggs, light brown sugar, granulated sugar, and vanilla extract together. Beat on high for 6–8 minutes until thick, pale, and ribboning when the whisk is lifted.
- Sift together the plain flour, cocoa powder, baking powder, espresso powder, and salt. Fold the dry mix gently into the egg mixture in two additions, keeping as much air as possible.
- Fold in the cooled melted dark chocolate until just combined. Avoid over-mixing.
- Pour into the prepared pan, smooth the top, and bake for 20–25 minutes until the top springs back slightly and a skewer comes out with a few moist crumbs.
- Cool completely in the tin on a wire rack. Once cool, remove from pan and, if needed, level the top so the sponge sits flat.
Prepare the Raspberry Purée and Gelatine
- Place 400 g raspberries and 100 g sugar in a saucepan with the 45 ml lemon juice. Warm gently and stir until the sugar dissolves and berries begin to break down for 3–5 minutes. Remove from heat.
- Strain if you want a seed-free mousse. Measure the purée consistency; you want it warm but not piping hot.
- Sprinkle the 2¼ tsp powdered gelatine evenly over a few tablespoons of cold water or directly over the lemon juice. Let bloom for 3–5 minutes, then stir into a small amount of the warm purée to dissolve fully, then mix back into the rest of the purée.
Whip the Cream and Assemble Mousse
- Whip the 480 ml cold double cream to soft–medium peaks. Stop when the cream holds a soft peak but is still glossy.
- Cool the raspberry + gelatine mixture until it is slightly thickened and just lukewarm. Fold one-third of the whipped cream into the purée to lighten it, then fold in the remaining cream gently until homogenous.
- Gently fold in the reserved 125 g fresh raspberries (whole or halved).
Build the Cake and Chill
- Place the cooled sponge in an 8-inch cake ring or the springform base. Pour the mousse over the sponge, smooth the top, and tap the pan gently to release air bubbles.
- Refrigerate for at least 4–6 hours, preferably overnight, until fully set.
Finish and Serve
- Once set, remove the ring or release the springform. Decorate with 50 g dark chocolate shavings and extra raspberries before serving.
- For neat slices, chill the cake well and wipe a hot knife clean between cuts.