Anna Louise A chocolate fudge cake is not merely a chocolate cake with fudge icing. It is a specific thing — a deeply moist, intensely chocolatey sponge with a dense, fudgy crumb that is richer than a standard chocolate sponge, covered in a thick, glossy fudge icing that sets to a soft, yielding consistency and tastes completely extraordinary.
Mary Berry’s chocolate fudge cake is the version I make for every occasion that calls for a genuinely impressive chocolate cake. Birthdays, celebrations, occasions where you want to make someone feel properly looked after.
It looks spectacular. It tastes even better. And despite its reputation, it is not difficult — the technique is straightforward and the results are consistently excellent.
The key difference between this and a standard chocolate cake is the fudge icing — a cooked icing made with butter, sugar, cream, and dark chocolate that sets to something silkier and more intense than any standard buttercream.
What Makes This a Fudge Cake
Cocoa powder bloomed in boiling water. Adding boiling water to cocoa before it goes into the batter releases the full aromatic compounds in the cocoa and produces a dramatically deeper chocolate flavour. This is the step that makes the difference between a good chocolate cake and an exceptional one.
The fudge icing. Standard chocolate buttercream — butter, icing sugar, cocoa — is good. The fudge icing in this recipe — butter, dark chocolate, cream, and golden syrup cooked together — is extraordinary. It sets to a soft, glossy, intensely chocolatey coating that makes the cake taste genuinely professional.
Ingredients for Mary Berry Chocolate Fudge Cake
For the Chocolate Sponge
- 225g unsalted butter, softened
- 225g caster sugar
- 4 large eggs, at room temperature
- 175g self-raising flour, sifted
- 50g good quality cocoa powder, sifted
- 1 tsp baking powder
- 4 tbsp boiling water
- 1 tsp vanilla extract
- 2 tbsp whole milk
For the Chocolate Fudge Icing
- 150g dark chocolate (70% cocoa solids), finely chopped
- 150g unsalted butter, cubed
- 150ml double cream
- 2 tbsp golden syrup
- 200g icing sugar, sifted
To Decorate
- Chocolate shavings or curls
- A dusting of cocoa powder
- Fresh raspberries (optional)
How to Make Mary Berry Chocolate Fudge Cake — Step by Step
Step 1 — Bloom the Cocoa
In a small bowl, mix the cocoa powder with the boiling water until a smooth, thick paste forms. Leave to cool for five minutes. This blooming releases the full chocolate flavour from the cocoa.
Step 2 — Preheat and Prepare
Preheat your oven to 180°C / 160°C fan / Gas 4. Grease two 20cm round sandwich tins and line the bases and sides with baking parchment.
Step 3 — Make the Batter
Beat the softened butter and caster sugar together with an electric hand whisk for four to five minutes until pale and fluffy. Add the eggs one at a time, beating well after each. Beat in the vanilla extract.
Add the bloomed cocoa paste and fold through until fully incorporated. The mixture will look very dark and glossy.
Sift in the flour and baking powder. Add the milk. Fold gently until just combined.
Step 4 — Bake
Divide equally between the two prepared tins. Smooth the tops and bake on the middle shelf for 25 to 30 minutes until a skewer comes out clean. Cool in the tins for 10 minutes, then turn out onto a wire rack to cool completely.
Step 5 — Make the Fudge Icing
Place the chopped dark chocolate, cubed butter, double cream, and golden syrup in a heavy-based saucepan over a low heat. Stir gently until everything has melted and combined into a smooth, glossy mixture.
Remove from the heat and sift in the icing sugar. Stir until smooth and completely lump-free. Leave to cool at room temperature, stirring occasionally, until the icing thickens to a spreadable consistency — about 30 to 45 minutes. Do not refrigerate to speed this up as it sets unevenly.
Step 6 — Assemble and Ice
Place one sponge on your serving plate. Spread a generous layer of fudge icing over the top. Place the second sponge on top. Pour or spread the remaining fudge icing over the top and sides, using a palette knife to smooth it or create swirls.
Decorate with chocolate shavings, a dusting of cocoa, or fresh raspberries. Leave the icing to set for 30 minutes before slicing.
My Top Tips
Always bloom the cocoa in boiling water. This single step transforms the depth of chocolate flavour in the sponge. Do not skip it.
Cool the fudge icing at room temperature. Refrigerating it causes it to set unevenly and become lumpy. Patience at room temperature gives you a smooth, glossy, perfectly spreadable icing every time.
Use 70% dark chocolate in the icing. Lower cocoa solids makes the icing too sweet and too soft. 70% gives depth, slight bitterness, and a proper fudge consistency once set.
Do not overbake the sponge. A chocolate sponge dries out quickly if left in the oven too long. Check at 25 minutes and remove as soon as the skewer is clean.
Let the icing drip naturally down the sides. Rather than trying to perfectly smooth the sides, pour a generous amount of icing on top and let it flow down naturally — it creates a beautiful, dramatic effect.
Serving Suggestions
At a birthday — this is the showstopping celebration cake that people remember. At a dinner party as dessert with a spoonful of crème fraîche alongside. With a strong cup of coffee — the bitterness of the coffee and the richness of the chocolate is a perfect combination.
How to Store
At room temperature: Store in an airtight container for up to 4 days. The icing stays glossy and the sponge stays moist.
In the freezer: Freeze unfrosted sponge layers for up to 3 months. Make the fudge icing fresh when ready to assemble.
Mary Berry Chocolate Fudge Cake Recipe
Ingredients
Method
- Mix cocoa with boiling water to a smooth paste. Cool 5 minutes.
- Preheat oven to 180°C / 160°C fan / Gas 4. Grease and line two 20cm sandwich tins.
- Beat butter and sugar 4–5 minutes until pale and fluffy. Add eggs one at a time. Beat in vanilla. Fold in cocoa paste. Sift in flour and baking powder, add milk, fold gently.
- Divide between tins. Bake 25–30 minutes until a skewer comes out clean. Cool completely.
- Melt chocolate, butter, cream, and golden syrup gently in a pan until smooth. Remove from heat. Sift in icing sugar. Stir until smooth. Cool at room temperature 30–45 minutes until spreadable.
- Sandwich sponges with fudge icing. Cover top and sides. Decorate. Leave to set 30 minutes before slicing.
Notes
Frequently Asked Questions
Can I make the fudge icing in advance?
Yes — make it a day ahead and store at room temperature covered with cling film. If it sets too firmly, warm gently in a saucepan over a very low heat and stir until spreadable again.
Why is my fudge icing grainy?
The icing sugar was not fully sifted before adding, or the mixture was stirred too vigorously while cooling. Always sift the icing sugar and stir gently while cooling.
Can I use milk chocolate instead of dark?
You can but the icing will be significantly sweeter and less intense. A mixture of 100g dark and 50g milk chocolate is a good compromise if you prefer a milder chocolate flavour.
Can I make this as a single layer traybake?
Yes — pour all the batter into a greased and lined 30x23cm traybake tin and bake at the same temperature for 35 to 40 minutes. Ice when cool and cut into squares.
Why did my chocolate sponge sink?
The oven door was opened too early, the oven temperature was too high, or there was too much raising agent. Wait until 25 minutes before checking and make sure your oven temperature is accurate.
How do I get a smooth icing finish?
Use a palette knife dipped in hot water and wiped dry. The warmth smooths the icing cleanly. Work in long, confident strokes from one side to the other.
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