Name: Classic Coffee and Walnut Cake – A British Favourite with Rich Buttercream & Crunchy Walnuts
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Ingredients: 200g self-raising flour; 1 tsp baking powder; 200g unsalted butter, softened; 200g caster sugar; 4 large eggs; 2 tbsp strong coffee, cooled; 75g chopped walnuts; 150g unsalted butter, softened; 300g icing sugar; 2 tbsp strong coffee, cooled; 12 walnut halves

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A Slice of British Baking Tradition

There’s just something timeless and elegant about a good old coffee and walnut cake. Maybe it’s the way the coffee’s subtle bitterness balances the sweet sponge, or maybe it’s those crunchy little walnut pieces in every bite. Either way, this cake has earned its place at every British teatime table—and for good reason.

I remember the first time I made this cake—it was for my mum’s birthday. She’s not one for overly sweet desserts, but she adores coffee. So this cake, with its rich buttercream and just the right hit of espresso flavor, was an instant hit. The texture is soft and moist, the flavour is balanced and grown-up, and the walnuts give it that nostalgic crunch that just makes you smile.

The best part? It’s easier to make than it looks. With two layers of light sponge, a smooth coffee buttercream, and a simple walnut topping, this is the kind of bake that delivers maximum payoff with minimal fuss. Whether you’re planning a celebration, baking for a coffee lover, or just fancy a slice with your afternoon cuppa, this classic coffee and walnut cake always hits the spot.

Let’s get into the ingredients and how to bring this beautiful bake together.

Ingredients

For the Sponge:

200g self-raising flour
1 tsp baking powder
200g unsalted butter, softened
200g caster sugar
4 large eggs
2 tbsp strong coffee, cooled
75g walnuts, chopped

For the Buttercream:

150g unsalted butter, softened
300g icing sugar
2 tbsp strong coffee, cooled

For Decoration:

12 walnut halves

Step 1: Preheat the Oven

Start by preheating your oven to 180°C (fan). Grease and line two 20cm round cake tins with parchment paper. This step is key to a smooth cake release—nobody wants stuck sponge after all that effort!

Step 2: Make the Sponge

In a large mixing bowl, beat the softened butter and caster sugar together until light and fluffy. This helps to create that soft, airy sponge we all love.

Add the eggs, one at a time, mixing well after each. Then stir in the cooled strong coffee. You can use instant coffee dissolved in a little hot water or leftover brewed coffee—just make sure it’s not hot when you add it, or you risk curdling the batter.

Sift in the self-raising flour and baking powder, and gently fold them into the wet mixture until just combined. Finally, stir through the chopped walnuts, making sure they’re evenly distributed.

Step 3: Bake the Cakes

Divide the batter evenly between your prepared cake tins and level out the tops with a spatula.

Bake in the preheated oven for 20–25 minutes, or until a skewer inserted into the centre comes out clean. The sponges should be golden and springy to the touch.

Leave the cakes to cool in the tins for 10 minutes, then carefully transfer them to a wire rack to cool completely. Trust me—don’t skip the cooling time. You want your sponges to be completely cool before you add any buttercream, or it’ll melt right off.

Buttercream, Assembly & Decorating Tips

Now comes the really satisfying part—making that rich, creamy coffee buttercream and assembling your cake. This is where the cake goes from “nice sponge” to “absolutely stunning centerpiece.”

Step 4: Make the Coffee Buttercream

In a bowl, beat the softened butter until smooth and creamy. Then gradually add the icing sugar, mixing well after each addition to avoid a sugar storm in your kitchen.

Once the sugar is fully incorporated, stir in the cooled strong coffee. Keep beating until you have a light, fluffy buttercream that’s easy to spread. You can adjust the coffee to taste if you like a stronger kick—just go slow, a little extra can go a long way.

Step 5: Assemble the Cake

Place one sponge cake on your serving plate or cake stand. Spread half of the buttercream over the top in an even layer. Use a palette knife if you have one—it makes the job super smooth (pun intended).

Top with the second sponge, then spread the remaining buttercream over the top. You can go rustic with swoops and swirls or smooth it out for a neater finish—it’s entirely up to you.

Step 6: Decorate

Finish off by arranging walnut halves around the top of the cake. This not only gives it a beautiful, classic look but also gives everyone a hint of what’s inside.

You could also pipe a few decorative swirls of buttercream on top before adding the walnut halves for a bakery-style finish if you’re feeling fancy.

Bonus Tips for a Perfect Coffee and Walnut Cake

Use fresh coffee: Whether instant or brewed, strong and cooled coffee gives the best flavour.
Toast your walnuts for an even nuttier depth—just a few minutes in a dry pan does the trick.
Room temp ingredients are a must! Cold butter or eggs can mess with your batter’s texture.

Don’t overmix once the flour goes in—gentle folding keeps the sponge light.

FAQ & Final Thoughts

Frequently Asked Questions

1. Can I make this cake in advance?
Yes! You can bake the sponges a day ahead. Store them in an airtight container. Assemble with buttercream the next day.

2. What coffee works best?
Strong instant coffee dissolved in a small amount of hot water is easiest. You can also use espresso or brewed coffee—just make sure it’s cooled.

3. Can I freeze coffee and walnut cake?
Absolutely. Freeze the unfrosted sponges wrapped well. Thaw at room temp and add buttercream before serving.

4. How do I store leftovers?
Store the cake in an airtight container at room temperature for up to 3 days. If it’s particularly warm, pop it in the fridge—but bring it to room temp before serving for best texture.

5. Can I make it gluten-free?
Yes, substitute the self-raising flour with a gluten-free self-raising blend. Add an extra ¼ tsp baking powder if needed.

6. Can I make cupcakes instead of a layer cake?
You sure can! This batter makes about 12 cupcakes. Bake at 180°C for 18–20 minutes, and top each with a swirl of coffee buttercream and a walnut half.

7. Is this cake very sweet?
It’s sweet, but the coffee and walnuts balance it out. You can slightly reduce the icing sugar in the buttercream if you prefer a less sweet finish.

Final Thoughts

This Classic Coffee and Walnut Cake is one of those bakes that never goes out of style. It’s sophisticated yet comforting, easy to make yet impressive enough for a special occasion. Whether you’re hosting afternoon tea, celebrating a birthday, or simply baking for yourself (because why not?), this cake brings warmth and flavour in every bite.

So go ahead, brew a pot of your favourite coffee, cut a generous slice, and enjoy a taste of traditional British baking at its best. And if you try it, I’d love to know how it turned out—did you stick to the classic or give it a twist?

What’s your ultimate teatime cake? Let’s chat cake ideas below!

Classic Coffee and Walnut Cake – A British Favourite with Rich Buttercream & Crunchy Walnuts

Author: Mouad Boulkhiout
Total Time: 45 minutes

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Description

This Classic Coffee and Walnut Cake is a beloved British bake that pairs soft, moist coffee sponge layers with crunchy walnuts and a smooth coffee buttercream frosting. It’s the perfect choice for birthdays, celebrations, or simply serving alongside a hot cup of tea. With simple ingredients and easy steps, this recipe delivers bakery-quality results in your own kitchen.

Ingredients

Scale

For the Sponge:

200g self-raising flour
1 tsp baking powder
200g unsalted butter, softened
200g caster sugar
4 large eggs
2 tbsp strong coffee, cooled
75g chopped walnuts

For the Buttercream:

150g unsalted butter, softened
300g icing sugar
2 tbsp strong coffee, cooled

For Decoration:

12 walnut halves

Instructions

Preheat oven:
Preheat to 180°C (fan) / 350°F. Grease and line two 20cm (8-inch) round cake tins.

Make the sponge:
Beat butter and sugar together until light and fluffy. Add eggs one at a time, beating well. Stir in cooled coffee. Sift in flour and baking powder, then fold gently into the batter. Stir in chopped walnuts.
Bake:
Divide batter evenly between tins and smooth the tops. Bake for 20–25 minutes, or until a skewer inserted into the centre comes out clean. Cool in tins for 10 minutes, then transfer to wire racks to cool completely.
Make the buttercream:
Beat butter until smooth. Gradually add icing sugar, then stir in cooled coffee. Beat until light and fluffy.

Assemble the cake:
Spread half of the buttercream on one sponge. Top with the second sponge and spread remaining buttercream on top.
Decorate:
Arrange walnut halves on top for a classic finish.

Notes

Ensure coffee is cooled before adding to batter or buttercream to prevent curdling or melting.

For a deeper flavor, lightly toast the chopped walnuts before adding.
Cake layers and buttercream can be made ahead and stored separately.
For a stronger coffee taste, increase coffee slightly in the buttercream (add gradually to avoid thinning).