This rich chocolate biscuit cake is a favourite of the Royal family. It’s a no-bake dessert made with digestive biscuits and dark chocolate — an easy recipe fit for a queen.
When Prince William married, he reportedly requested a chocolate biscuit cake for his groom’s cake. This no-bake treat is beloved across the Royal household — including Queen Victoria, who was said to enjoy a simple refrigerator cake. Despite the many elaborate dishes available at royal events, this humble chocolate fridge cake remains a timeless favourite.
The Perfect Chocolate Biscuit Cake
The recipe uses everyday ingredients common in the UK: golden syrup and McVities Digestive Biscuits. Outside the UK, you can usually find these in import stores or the international aisle of supermarkets. Golden syrup can be substituted with light corn syrup if necessary, and digestives can be swapped for graham crackers or shortbread if you can’t find them — although digestives give the most authentic flavour. 
To prepare the cake, melt butter and chopped dark chocolate together with golden syrup and heavy cream until the mixture is glossy and smooth. Stir in broken biscuits — I prefer larger pieces roughly the size of a coin, but adjust to your preference. Press the chocolate-biscuit mixture into a round cake pan lined with plastic wrap and lightly greased, then chill until set. There’s no baking involved — simply let the cake firm up in the refrigerator.
Once the cake is set, remove it from the pan using the plastic wrap overhang. Top with a thick chocolate ganache for an elegant finish, or skip the ganache and dust the cake with powdered sugar or cocoa for a lighter presentation. 
Quality chocolate makes a noticeable difference. Choose dark chocolate in the 50–70% cocoa range; the golden syrup and cream add sweetness and richness, so very high-percentage chocolate can make the cake overly bitter. For the ganache, aim for similar or slightly lower cocoa content so the topping balances the body of the cake.
Variations & Substitutions
- Pan sizes: I use an 8-inch (20 cm) round pan with high sides, such as a springform. A 6-inch pan with high sides or a 9-inch pan will also work. You can make it in a 9×5-inch loaf pan if preferred.
- Add-ins: The cake is lovely with chopped nuts and dried fruit. Keep the chocolate, butter, syrup, and cream quantities the same, and adjust biscuits and extras as follows:
- 200 grams digestive biscuits (about half a package) if using nuts and fruit
- 1/4 cup dried fruit — raisins, dried cranberries, or chopped apricots
- 1 cup chopped nuts — walnuts, hazelnuts, or almonds. Toast nuts first for best flavour: spread on a baking sheet and bake 7–10 minutes at 350°F (180°C).
This style of fridge cake shares qualities with other no-bake treats such as chocolate hedgehog slice and Canadian Nanaimo bars; if you enjoy this recipe, exploring those classics is a great next step.
Chocolate Biscuit Cake
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Equipment
- 8-inch (20cm) round cake pan*
Ingredients
Chocolate Biscuit Cake
- 400 grams digestive biscuits*, 1 package
- 450 grams dark chocolate*, 50–70%
- 225 grams unsalted butter, cut into pieces
- 1/3 cup golden syrup*
- 1/3 cup heavy cream
Chocolate Ganache
- 170 grams dark chocolate, 50–70% (I typically use 50%)
- 1/2 cup heavy cream
Instructions
Chocolate Biscuit Cake
- Line an 8-inch (20 cm) round pan with high sides with plastic wrap, leaving an overhang around the sides.
- Break the digestive biscuits into pieces and place them in a large bowl — I usually break each biscuit into about 6 pieces.
- Set up a double boiler: add about 1/2–1 inch (1–2 cm) of water to a medium saucepan over low–medium heat and place a heatproof bowl on top, ensuring it doesn’t touch the water.
- Add the chopped chocolate and butter to the bowl and stir gently until fully melted and smooth.
- Remove the bowl from the heat and whisk in the golden syrup and heavy cream until combined.
- Pour the chocolate mixture over the broken biscuits and stir until the pieces are well coated.
- Spoon the mixture into the prepared pan and smooth the top. Refrigerate for at least 4 hours to set.
Chocolate Ganache Topping
- Finely chop the ganache chocolate and place it in a heatproof bowl.
- Warm the cream until almost boiling, either in the microwave or on the stove while stirring gently.
- Pour the hot cream over the chocolate and let sit for 2–5 minutes to melt.
- Whisk until smooth. If needed, microwave briefly on medium power for about 45 seconds and whisk until fully combined.
- Remove the cake from the fridge, lift it out using the plastic wrap overhang, and peel back the plastic. Place the cake on a serving plate.
- Spoon the ganache over the cake, smooth the top, and return to the fridge to let the ganache set.
Notes
- Use a pan with high sides (at least 2–3 inches). A 9-inch pan or a 9×3-inch loaf pan are acceptable alternatives.
- Digestive biscuits are common in the UK and Australia and are typically found at import grocers in the US and Canada. Substitute graham crackers or shortbread if needed.
- I recommend 50% dark chocolate for the best balance. Semi-sweet is acceptable; avoid chocolate stronger than 70% in the cake and above 60% for the ganache to prevent excessive bitterness.
- Golden syrup can be replaced with corn syrup if preferred.
- Store the cake covered in the fridge for up to 5 days. Wrap tightly and freeze for up to 2 months; thaw in the fridge before serving.
- Nutrition information is an estimate based on dividing the cake into 14 equal slices.
Nutrition
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