This rich and indulgent fudge cake inspired by James Martin is everything a chocolate lover could wish for. It has a deep cocoa flavour, a soft, moist crumb, and a silky smooth fudge frosting that melts in the mouth. Despite its impressive finish, it is straightforward to make and suitable for confident beginners. From start to finish, it takes around 1 hour and 30 minutes, making it perfect for special occasions or a weekend bake.
Ingredients
For the Cake
- 200g plain flour
- 50g cocoa powder
- 2 tsp baking powder
- 1 tsp bicarbonate of soda
- 250g caster sugar
- 3 large eggs
- 200ml whole milk
- 150ml vegetable oil
- 1 tsp vanilla extract
- 150ml boiling water
For the Fudge Frosting
- 200g dark chocolate, chopped
- 150ml double cream
- 50g butter
For Preparation
- Butter for greasing
- Baking parchment
How to Make James Martin Fudge Cake
- Prepare the oven: Preheat the oven to 180°C or 160°C fan. Grease and line two 20cm round cake tins and place a shelf in the centre of the oven.
- Mix the dry ingredients: Sift the flour, cocoa powder, baking powder and bicarbonate of soda into a large bowl.
- Combine the batter: Add the sugar, eggs, milk, oil and vanilla extract. Whisk until smooth and lump free.
- Add hot water: Carefully pour in the boiling water and mix gently. The batter will be quite thin.
- Bake the cakes: Divide the mixture evenly between the tins. Bake for 25 to 30 minutes until the cakes are risen and a skewer comes out clean.
- Cool completely: Leave the cakes to cool in the tins for 10 minutes, then turn out onto a wire rack.
- Make the frosting: Heat the cream and butter until just warm, then pour over the chopped chocolate. Stir until smooth and glossy.
- Assemble the cake: Spread frosting between the layers and over the top. Allow it to set slightly before slicing.

Tips
Why is my cake dry?
This usually means it has been overbaked. Check a few minutes early and remove once a skewer comes out clean.
How do I get a deeper chocolate flavour?
Use high quality cocoa powder and dark chocolate with at least 60 percent cocoa solids.
Why is my frosting too runny?
Let it cool for a little longer. It thickens naturally as it sets.
Can I make it extra moist?
Adding a tablespoon of sour cream or yoghurt to the batter can enhance moisture.
Serving Suggestions
- Serve with a scoop of vanilla ice cream
- Pair with fresh berries for balance
- Enjoy with a cup of tea or coffee
- Dust lightly with icing sugar for a simple finish
Storage
Room Temperature
Store in an airtight container for up to 2 days in a cool place.
Refrigerator
Keeps well for up to 5 days. Bring to room temperature before serving for best texture.
Freezing
Freeze unfrosted sponge layers for up to 3 months. Wrap well and thaw before assembling.
Nutrition
- Calories: 450 kcal
- Carbohydrates: 55g
- Protein: 6g
- Fat: 24g
- Saturated Fat: 10g
- Sodium: 280mg
These values are approximate and may vary depending on ingredients used.
FAQs
Can I make this cake ahead of time?
Yes, the sponge can be baked a day in advance and stored well wrapped before frosting.
Can I use milk chocolate instead of dark chocolate?
You can, but the frosting will be sweeter and less rich in flavour.
Can I bake this in one tin?
Yes, but increase the baking time and ensure the centre is fully cooked before removing.
How do I know when the cake is done?
Insert a skewer into the centre. If it comes out clean, the cake is ready.
James Martin Fudge Cake
Course: DessertCuisine: BritishDifficulty: Easy10
slices20
minutes30
minutes90
minutes450
kcal50
minutesA rich and moist chocolate fudge cake with a deep cocoa flavour and smooth, indulgent frosting. Perfect for celebrations or an everyday chocolate treat.
Ingredients
200g plain flour
50g cocoa powder
2 tsp baking powder
1 tsp bicarbonate of soda
250g caster sugar
3 large eggs
200ml whole milk
150ml vegetable oil
1 tsp vanilla extract
150ml boiling water
200g dark chocolate
150ml double cream
50g butter
Butter and parchment for tins
Directions
- Preheat oven to 180°C (160°C Fan). Grease and line two 20cm round cake tins.
- Sift flour, cocoa powder, baking powder and bicarbonate of soda into a large bowl.
- Add sugar, eggs, milk, oil and vanilla extract, then whisk until smooth.
- Carefully mix in boiling water to loosen the batter.
- Divide between tins and bake for 25–30 minutes until risen and set.
- Cool in tins briefly, then transfer to a wire rack to cool completely.
- Heat cream and butter, then pour over chopped chocolate and stir until smooth.
- Spread frosting between layers and over the top of the cake.
Notes
- Use good quality cocoa powder for a richer flavour.
- Do not overbake to keep the sponge moist.
- The frosting will thicken as it cools, making it easier to spread.
