I make this cake for people who say they love chocolate, and when they eat it they go very quiet for a moment before saying anything. That moment of silence is the best possible reaction to a cake and it happens every single time with this one.

Death by chocolate is not an understatement — this is three layers of deeply dark, intensely moist chocolate sponge, filled with dark chocolate ganache, covered in chocolate buttercream, and decorated with chocolate curls and a final dusting of cocoa powder. There is nothing here that is not chocolate.

It is the cake for a significant birthday, for a celebration that requires something genuinely show-stopping, and for anyone who has ever been served a slice of supposedly chocolate cake that tasted only vaguely of chocolate and felt disappointed. This cake will never disappoint anyone who came for chocolate.

The key is the quality of the chocolate and cocoa used throughout — and the espresso powder, which I add to the sponge batter. It does not make the cake taste of coffee. It makes it taste more intensely and more completely of chocolate.

Ingredients for Mary Berry Death by Chocolate Cake

For the Triple Chocolate Sponge (Three Layers)

300g unsalted butter, softened
300g soft dark brown sugar
5 large eggs, at room temperature
250g self-raising flour, sifted
75g good quality cocoa powder, sifted
2 tsp baking powder
2 tsp instant espresso powder dissolved in 2 tbsp hot water — cooled
3 tbsp whole milk
100g dark chocolate (70%), melted and cooled
1 tsp vanilla extract

For the Dark Chocolate Ganache Filling

200g dark chocolate (70%), finely chopped
200ml double cream
2 tbsp golden syrup
25g unsalted butter, cold and cubed

For the Chocolate Buttercream

250g unsalted butter, softened
500g icing sugar, sifted twice
75g good quality cocoa powder, sifted
4–5 tbsp whole milk
1 tsp vanilla extract
Pinch of fine salt

To Decorate

Dark chocolate curls or shavings — made from a bar of chocolate using a vegetable peeler
A generous dusting of cocoa powder
A few fresh raspberries — optional, their sharpness is wonderful against the dark chocolate

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How to Make Mary Berry Death by Chocolate Cake

Step 1 — Make the Chocolate Sponge

Preheat your oven to 180°C / 160°C fan / Gas 4. Grease three 20cm round sandwich tins and line the bases with baking parchment.

Beat the softened butter and dark brown sugar together for five minutes until pale and fluffy — dark brown sugar never becomes as pale as white but the mixture should lighten significantly. Add the eggs one at a time, beating well after each. Add the vanilla extract and the cooled dissolved espresso.

Add the cooled melted chocolate and beat until combined.

Sift the flour, cocoa powder, and baking powder into the bowl. Add the milk. Fold gently until just combined — the batter will be rich, dark, and deeply fragrant.

Divide equally between the three tins — I weigh the batter for exactly even layers. Bake for 20 to 24 minutes until risen and a skewer comes out with a few moist crumbs.

Cool in the tins for ten minutes. Turn out onto wire racks and cool completely — at least one hour.

Step 2 — Make the Ganache

Heat the cream and golden syrup until just simmering. Pour over the finely chopped chocolate. Leave for two minutes. Stir from the centre until completely smooth. Add the cold cubed butter and stir until melted. Cool for 45 minutes to one hour until thick and spreadable.

Step 3 — Make the Chocolate Buttercream

Beat the softened butter alone for four full minutes until very pale and fluffy. Add the double-sifted icing sugar and cocoa powder in three batches, beating well after each. Add the vanilla, salt, and enough milk to give a smooth, spreadable consistency. Beat for two more minutes.

Step 4 — Assemble

Place the first sponge on a serving plate. Spread half the ganache generously over the surface. Place the second sponge on top. Spread the remaining ganache. Place the third sponge on top and press down very gently.

Spread the chocolate buttercream over the top and sides of the cake in a generous, even layer — covering completely. I use a large palette knife dipped in hot water for the smoothest possible finish, or give the sides a deliberately textured, slightly swirled look with the back of a spoon.

Step 5 — Decorate

Scatter dark chocolate curls generously over the top. Dust the entire surface with a fine layer of cocoa powder. Add a few fresh raspberries if using. Leave to set at room temperature for thirty minutes before slicing.

My Top Tips For Best Mary Berry Death by Chocolate Cake

Dark brown sugar in the sponge — not caster. The molasses in dark brown sugar gives a deeper, slightly more complex character to the chocolate sponge. Combined with the cocoa powder, the melted chocolate, and the espresso powder, it gives a sponge that tastes genuinely extraordinary rather than simply of chocolate.

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The espresso powder is not optional. I cannot overstate this. Espresso does not make the cake taste of coffee — it amplifies and deepens the chocolate flavour in a way that no other addition achieves. Two teaspoons of instant espresso dissolved in hot water, cooled, and added to the batter is the secret that people cannot identify but always respond to.

Melted chocolate in the batter alongside the cocoa. Most chocolate cakes use either cocoa powder or melted chocolate — this one uses both. The cocoa gives an intense, slightly bitter chocolate flavour throughout the crumb. The melted chocolate gives richness, depth, and the slightly fudgy texture that makes this sponge specifically wonderful.

Allow the ganache to reach spreading consistency. Poured too warm, it runs straight off the sponge. Left too long, it sets too firm to spread smoothly. Forty-five minutes to one hour at room temperature gives the sweet spot — thick enough to hold in a generous layer between the sponges.

Make chocolate curls directly on the assembled cake. Run a vegetable peeler firmly along the edge of a chocolate bar at room temperature and let the curls fall directly onto the cake. This takes three minutes and looks far more impressive and far more naturally beautiful than any other chocolate decoration.

Serving Suggestions

At a birthday as the undisputed centrepiece — nothing else on the table will compete. As a celebration cake for any occasion where chocolate is appropriate, which is most occasions. With a small glass of dessert wine alongside — the combination of intensely dark chocolate and a sweet Muscat or Pedro Ximénez is genuinely wonderful.

How to Store Mary Berry Death by Chocolate Cake

At room temperature: Store in an airtight container for up to 4 days. The chocolate flavour deepens over the first two days.

In the freezer: Freeze unfilled, unfrosted sponge layers for up to 3 months. Make the ganache and buttercream fresh when assembling.

Mary Berry Death by Chocolate Cake Recipe

Mary Berry's death by chocolate cake is a rich, deeply dark triple-layer chocolate cake with ganache, chocolate buttercream, and chocolate curls — completely extraordinary.

Print Recipe Pin Recipe

Prep Time 35

Cook Time 20

Cooling & Setting Time 2

Total Time 2 55

Servings: 12 Slices

Course: Dessert

Cuisine: British

Calories: 680

Ingredients Method Notes

Ingredients

Triple Chocolate Sponge:
300 g unsalted butter softened
300 g soft dark brown sugar
5 large eggs room temperature
250 g self-raising flour sifted
75 g good quality cocoa powder sifted
2 tsp baking powder
2 tsp instant espresso powder dissolved in 2 tbsp hot water — cooled
3 tbsp whole milk
100 g dark chocolate 70%, melted and cooled
1 tsp vanilla extract
Dark Chocolate Ganache Filling:
200 g dark chocolate 70%, finely chopped
200 ml double cream
2 tbsp golden syrup
25 g cold unsalted butter cubed
Chocolate Buttercream:
250 g unsalted butter softened
500 g icing sugar sifted twice
75 g good quality cocoa powder sifted
4 –5 tbsp whole milk
1 tsp vanilla extract
Pinch of fine salt
Decoration:
Dark chocolate curls
Cocoa powder for dusting
Fresh raspberries optional

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Method

Preheat oven to 180°C / 160°C fan / Gas 4. Grease and line three 20cm tins. Beat butter and dark brown sugar 5 minutes. Add eggs one at a time. Add vanilla, dissolved espresso, and cooled melted chocolate — beat until combined. Sift in flour, cocoa, and baking powder. Add milk — fold gently. Divide between tins — weigh for even layers. Bake 20–24 minutes until skewer shows moist crumbs. Cool completely.
Heat cream and syrup to just simmering — pour over chopped chocolate. Leave 2 minutes. Stir smooth. Add cold butter — stir until melted. Cool 45 minutes until spreadable.
Beat butter alone 4 minutes. Add icing sugar and cocoa in 3 batches. Add vanilla, salt, and milk — beat 2 more minutes.
Place first sponge on plate. Spread half the ganache. Top with second sponge — spread remaining ganache. Top with third sponge.
Cover top and sides completely with chocolate buttercream. Scatter chocolate curls. Dust generously with cocoa. Add raspberries if using. Set 30 minutes. Slice.

Notes

Dark brown sugar in the sponge — gives a deeper, more complex chocolate character than white.

Espresso powder is not optional — it amplifies and deepens the chocolate flavour dramatically.

Use both cocoa and melted chocolate in the batter — gives intensity and fudgy richness together.

Allow ganache to reach spreading consistency — 45 minutes at room temperature.

Make chocolate curls with a vegetable peeler along the edge of a room temperature bar of chocolate.

Freeze unfrosted sponge layers for up to 3 months.

Frequently Asked Questions

Can I make this as a two-layer cake?

Yes — use the same quantities and divide between two 20cm tins. Bake for 25 to 28 minutes. The cake is slightly less dramatic in height but equally wonderful in flavour.

Can I add a cherry filling for a Black Forest version?

Yes — replace the ganache filling with whipped cream and a layer of morello cherry compote between each layer. See the Black Forest gateau recipe on this site.

Why is my chocolate buttercream grainy?

The cocoa powder was not sifted thoroughly enough, the butter was too cold, or the icing sugar was not double-sifted. Sift everything twice and ensure the butter is genuinely at room temperature.

Can I use milk chocolate instead of dark?

Milk chocolate gives a sweeter, less intense result. Reduce the icing sugar in the buttercream by 75g to compensate. This is no longer death by chocolate — it is more of a gentle chocolate suggestion. Both are good; they are different cakes.