This gluten-free chocolate orange cake is a soft, two-layer sponge flavoured with fresh orange zest and filled and topped with silky chocolate ganache. It uses straightforward UK measurements and a gluten-free flour blend, so you can make a celebratory cake without complicated techniques or hard-to-find ingredients.
Ingredients
- 200g unsalted butter, softened, plus a little extra for greasing the tins
- 200g caster sugar
- 4 medium eggs, at room temperature
- 170g gluten-free self-raising flour
- 30g unsweetened cocoa powder
- 1 teaspoon gluten-free baking powder
- ¼ teaspoon fine salt
- 2 medium unwaxed oranges, finely zested
- 2 tablespoons orange juice, freshly squeezed
- 1 tablespoon milk, dairy or unsweetened plant milk
- 200g dark chocolate, finely chopped, for the ganache
- 200ml double cream, for the ganache
- 1 tablespoon golden syrup, optional, for a softer, shinier ganache
- 1 teaspoon orange zest, extra, to decorate
Instructions
- Prepare the tins and oven. Heat the oven to 180°C conventional or 160°C fan, Gas Mark 4. Grease two 20cm round cake tins and line their bases with baking parchment. If you have only one tin, bake the sponges in two batches rather than filling the tin too deeply; keep the remaining batter covered at room temperature while the first cake bakes.
- Mix the dry ingredients. Sift the gluten-free flour, cocoa powder, baking powder and salt into a bowl. Cocoa can form small lumps, so press any stubborn ones through the sieve. Stir the mixture together so the raising agent is distributed evenly. This helps the sponges rise uniformly and avoids pockets of bitter cocoa.
- Cream the butter, sugar and orange zest. In a large bowl, beat the softened butter, caster sugar and zest from both oranges for about 3–4 minutes, until pale and fluffy. An electric hand mixer makes this quick, but a wooden spoon works too. The butter should be soft enough to dent easily without looking oily or melted. Scrape down the bowl once or twice so no dense butter is left at the bottom.
- Add the eggs. Beat in the eggs one at a time, mixing well after each addition. If the mixture starts to look slightly curdled, add a spoonful of the measured flour mixture and continue beating; it should come together as you add the dry ingredients. Avoid adding cold eggs straight from the fridge, as they can make the butter mixture split.
- Finish the batter. Add the dry mixture in two portions, folding gently with a spatula or mixing on the lowest speed just until no dry flour remains. Fold in the orange juice and milk. The batter should be thick but easy to spoon into the tins. Gluten-free flour blends vary, so if yours makes the batter unusually stiff, add one extra teaspoon of milk rather than pouring in a large amount at once.
- Bake the sponges. Divide the batter evenly between the prepared tins and level the tops. Bake for 24–30 minutes, swapping the tins between oven shelves after about 18 minutes if your oven browns unevenly. The cakes are ready when the centres spring back lightly when touched and a skewer inserted in the middle comes out clean or with a few dry crumbs. If the skewer shows wet batter, bake for another 3 minutes and test again.
- Cool completely. Leave the cakes in their tins for 10 minutes, then carefully turn them out onto a wire rack, peel away the parchment and let them cool fully. Gluten-free sponges can be more fragile while warm, so resist the temptation to stack or trim them at this point. A warm cake will also melt the ganache and make it difficult to spread neatly.
- Make the ganache and assemble. Put the chopped chocolate in a heatproof bowl. Warm the double cream in a small pan until steaming and just beginning to form bubbles around the edge; do not let it boil. Pour it over the chocolate, leave for 2 minutes, then stir gently from the centre until smooth. Mix in the golden syrup, if using, and let the ganache cool until thick enough to spread, usually 30–60 minutes depending on the room temperature. Place one sponge on a plate, spread over roughly a third of the ganache, add the second sponge and cover the top and sides with the rest. Finish with the extra orange zest.
Tips
- Check the flour blend. Use a gluten-free self-raising blend that is suitable for cakes. Some blends already contain xanthan gum, while others do not; follow the packet guidance rather than automatically adding extra, which can make a sponge gummy. Check the baking powder and chocolate labels too, especially if baking for someone with coeliac disease.
- Measure the juice accurately. The recipe needs only two tablespoons. Adding the juice of both oranges can make the batter too wet and the middle may sink before it sets. Use the rest of the fruit in a drink or serve it alongside the cake.
- Take care not to overmix. Once the flour goes in, fold only until combined. A few small bubbles are normal, but prolonged mixing can make a gluten-free sponge heavy. For an even bake, divide the batter equally; weighing the filled tins is an easy way to check.
- Let the ganache thicken naturally. If it is too runny, give it more time at room temperature, stirring occasionally. If it becomes too firm to spread, warm it in short bursts of a few seconds or set the bowl briefly over warm water, stirring gently. Do not assemble the cake until the sponges are completely cool.
Serving Suggestions
For clean slices, use a sharp knife warmed in hot water and wiped dry between cuts. The cake is rich, so modest slices work well after a meal. Serve at room temperature with lightly whipped cream, crème fraîche or a scoop of vanilla ice cream; a few fresh orange segments add a bright, juicy contrast. If you prefer a less rich finish, leave the sides unfrosted and serve each slice with a spoonful of thick yoghurt. For a birthday or afternoon tea, decorate the top with curls of chocolate and thin strips of candied orange peel just before serving.
Variations
- Make it dairy-free: Use a firm plant-based baking block in place of butter, and choose a dairy-free dark chocolate. Replace the double cream with a plant-based cream suitable for heating, following its carton instructions. Results vary between products, so check that the ganache sets before layering; a dairy-free frosting made with icing sugar and plant-based spread is another option.
- Use a buttercream filling: If you would rather avoid ganache, beat 100g softened butter with 200g sifted icing sugar, then add 1–2 teaspoons of orange juice and a little zest. Spread it between the cooled layers and use the remaining ganache, or extra buttercream, on top.
- Add a crunch: Scatter 40g chopped toasted hazelnuts over the filling or around the top edge. Check the guests’ allergy requirements first, and keep nuts separate if serving a mixed group.
- Make a single-layer cake: Bake the batter in one deep 20cm tin for around 35–45 minutes, checking from 35 minutes onwards. The middle takes longer to cook, so cover the top loosely with foil if it is browning before the centre is done. Cool completely before adding ganache.
Storage and Reheating
Keep the assembled cake in an airtight cake tin or covered container in a cool place for up to 2 days. If your kitchen is warm, or the ganache is soft, refrigerate it instead. Chilled cake will keep for about 4 days, although the sponge may feel firmer in the fridge. For the best texture, take slices out 30–45 minutes before serving so the ganache softens and the orange flavour comes through. Cake does not need reheating; warming it can melt the coating and dry the sponge.
You can freeze the unfilled sponges for up to 2 months. Once completely cool, wrap each one tightly in cling film and then foil, or place it in a freezer-safe container. Defrost while still wrapped at room temperature for several hours, then fill and decorate. Slices of the assembled cake can also be frozen, ideally separated with baking parchment, for up to 1 month. Thaw them in the fridge or at room temperature while covered. Do not refreeze cake that has already been defrosted.
Frequently Asked Questions
Is this chocolate orange cake safe for someone with coeliac disease?
The recipe is made without wheat, barley or rye, but ingredients and kitchen handling matter. Choose flour, baking powder, chocolate and any decorations labelled gluten-free, and avoid cross-contamination from shared utensils, tins or work surfaces. If baking for someone with coeliac disease, check their requirements and the current product labels carefully.
Can I use plain gluten-free flour instead of self-raising?
Yes. Replace the 170g gluten-free self-raising flour with 170g gluten-free plain flour and increase the baking powder to 2½ teaspoons in total. Check that the baking powder is gluten-free. If your plain flour blend contains a raising agent or has specific instructions for cakes, follow its packet guidance and avoid adding more raising agent than recommended.
Why did my sponge sink in the middle?
A sunken centre is usually a sign that the cake was underbaked, the oven door was opened early, or the batter contained too much liquid. Check that the centre springs back and the skewer comes out without wet batter before removing the cakes. Oven temperatures can vary, so use an oven thermometer if cakes regularly bake too quickly or slowly. Measure the orange juice rather than estimating it.
Can I make the cake ahead of time?
Yes. Bake the sponges a day ahead, cool them completely, wrap them well and keep them at room temperature, or freeze them for longer storage. Make the ganache and assemble the cake on the day you plan to serve it, or assemble it the evening before and keep it covered in a cool place. If the room is warm, refrigerate it and allow time for it to soften before serving.
Can I bake this as cupcakes?
Yes. Divide the batter between about 12 standard cupcake cases, filling each around two-thirds full. Bake at the same oven temperature for approximately 18–22 minutes, checking for a springy top and a clean skewer from 18 minutes. Cool completely before adding ganache. Cupcakes may need less ganache than a layer cake, so spread a modest amount on each or pipe a small swirl.