My recipe for a classic Coffee & Walnut Cake. Three layers of delicious coffee sponge packed full of chopped walnuts and topped with smooth coffee buttercream.
This Friday is the Macmillan World’s Biggest Coffee Morning and I thought I’d share with you what I’m going to be making to take along to the one at my boys’ school. It’s my version of a classic coffee & walnut cake.
As you may have realised, I’m a bit of a fan of cake. However, there’s one cake I love above all others and that is coffee & walnut. If I spot it in a café then I really struggle to resist buying a slice to have with a pot of tea (as a side note shouldn’t all tea in cafés come in a pot? It’s just not the same having just one cup). For me a good coffee and walnut cake should have a really good coffee flavour and lots of walnuts running all the way through and that’s what I’ve made here.
I’ve bowed to Pinterest peer pressure and made my cake with three layers (you can never find simple 2-layer cakes on there). I think this particular cake works well with three layers as it means you can have extra buttercream, but if you’ve only got two tins I’ve added some extra notes below the recipe to adapt it. I also got a bit carried away with my piping bag to make it look pretty. If you’re not a fan of piping then just slather it on with a knife, it’ll still taste amazing 🙂
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Coffee & Walnut Cake
INGREDIENTS
For the coffee & walnut sponge
- 10 g 2 tbsp coffee powder - (or instant coffee granules ground in a spice grinder or pestle and mortar)
- 150 g self-raising flour
- 165 g soft light brown sugar
- 165 g soft margarine - or butter
- 3 medium eggs
- 1½ tsp milk
- ⅛ tsp salt
- 75 g chopped walnuts
For the coffee buttercream
- 250 g softened butter
- 500 g icing sugar
- ¼ tsp vanilla extract
- 3 tbsp instant coffee granules
- 1½ tbsp boiling water
To decorate
- 25 g chopped walnuts
- A handful of walnut halves
INSTRUCTIONS
Make the coffee & walnut sponge
- Pre-heat your oven to 160ºC/140ºC fan.
- Line 3x18cm round sandwich tins (I use these liners).
- Sift the self-raising flour (150g), coffee powder (10g) into a large bowl and salt (⅛ tsp). Add the remaining ingredients (3 medium eggs, 165g soft margarine, 165g soft light brown sugar and 1½ tsp milk) and mix until fully combined (either by hand or using an electric mixer on a low speed). Fold in the chopped walnuts (75g).
- Divide the mixture equally between the three tins.
- Bake for 20-25 minutes until a skewer inserted into the middle comes out clean. Leave the cakes to cool in their tins for about 10 minutes, then remove them from their tins and move them to a wire rack to cool fully before decorating.
Make the coffee buttercream
- Mix the instant coffee granules (3 tbsp) with the boiling water (1½ tbsp) and then set aside to cool.
- Cut the butter (250g) into cubes and then beat on a low-medium speed until soft. Gradually add the icing sugar (you add it gradually to stop it flying everywhere) and beat until fully combined.
- Add the vanilla extract (¼tsp) and add the coffee a teaspoon at a time, beating in each addition before adding more.
- Check the consistency of your buttercream. It should be soft and perfect for piping at this point. If it’s still a little stiff then beat in a little milk.
Decorate
- Place the bottom layer of your cake onto your chosen dish. Cover with ⅓ of your buttercream. Sprinkle over half of the chopped walnuts.
- Place another layer on top and repeat the last step.
- Place the final layer on top. Decorate with the remaining buttercream and then finish with the walnut halves.
NOTES
- I've decorated my cakes by piping buttercream roses and then filling any gaps around the edge with a little extra squirt of buttercream. I used a JEM 1B nozzle.
- If you'd prefer to make this as a 2-layer cake then the only change you'll need is to increase the cooking time to 30-35 minutes. You'll also need ⅔ of the buttercream (or you could use the extra buttercream to make a thin coating around the outside of the cake.
- If you'd like to bake the cake in one deep tin and then slice it up into layers, you'll need to increase the cooking time to 45-50 minutes.
- The undecorated cakes are suitable for freezing. Simply wrap them tightly in clingfilm and pop them into the freezer. Defrost them thoroughly before decorating.
NUTRITIONAL INFORMATION
Any nutritional information provided is the estimated nutritional information per serving. Please refer to my guide to Charlotte’s Lively Kitchen nutritional information if you would like to learn more about how this is calculated.
Free From/Suitable For…
- Suitable for Vegetarians
- Soy-Free
The ingredients for this recipe are easily available free from all these allergens. However, please ensure you double-check allergen information for all ingredients.
Clare says
I made this cake as a treat for work. I work in the hospital and it went down fantastic (during this pandemic) such great comments from the staff and doctors. Thank you your recipes are brilliant!
karen keightley says
Hi Charlotte
I always make your cakes they are perfect every time thankyou but everytime I try to make the buttercream fillings they are far to runny I’ve tried using less butter it looked ok but then all ran out of the cake today I had another go at the coffee one so disappointed can you help regards karen
Charlotte Oates says
I’m so glad to hear you enjoyed the cake, but I’m sorry to hear that the icing isn’t turning out as expected. It sounds as though either:
* Your butter was too soft when you made the buttercream.
* You’ve added too much liquid, either coffee or additional milk for consistency.
* The coffee was hot when you added it, so softened the butter leaving runny buttercream.
* You added too much coffee in one go so it didn’t combine with the butter properly.
I’d recommend you take a look at the video on my coffee buttercream post. Hopefully this will show you the consistency as you go and might help you spot where it could have gone wrong.
Rebecca says
I used the right sized tins and this was nowhere near enough mixture for 3 layers! One didn’t even reach the edge of the tin after it came out of the oven!
Charlotte Oates says
I’m sorry to hear that the cake didn’t turn out as expected. Did you smooth the mixture in the tins before baking (so that it was in an even layer)? The layers are designed to be thinner than a standard cake (as I wanted 3 layers, but only the height of a 2-layer cake).
Vida Djuric says
Lovely, moist cake, taste the coffee and walnuts.
Need to double up ingredients, as I used 9in tins, 2 off, so not much cake, figured, after already starting, but was in a rush, so did not check out properly.
Nevertheless, lovely cake.
Tania says
Hi, I couldn’t get coffee powder, can I use coffee essence instead? If so, how much? Thanks!
Charlotte Oates says
I’ve not tested this cake with coffee essence so I’m not sure how well it would work – sorry.
Sandra says
Amazing recipe! I divided all the amounts by 3 as it’s still lockdown here (UK) and I live on my own ahah! Used a 11cm tin, baked in one go for 35-40min at 140 fan and it turned out great.
Very tasty, will do again!