Coffee Walnut Cake Recipe

Craving a cake that blends deep coffee flavor with crunchy walnuts? This coffee walnut cake recipe is a timeless favorite, known for its rich sponge and smooth buttercream icing. Whether you’re baking for a gathering or treating yourself, this step-by-step guide shows you how to create the perfect coffee walnut cake at home.

Introduction to Coffee Walnut Cake

What is a Coffee Walnut Cake?

Coffee walnut cake is a soft sponge layered with coffee-flavored buttercream and packed with chopped walnuts. It’s a traditional British bake that’s ideal for coffee lovers looking for a balanced, not-too-sweet dessert.

Why Coffee and Walnuts Work So Well Together

The boldness of instant coffee and the earthy crunch of walnuts create a unique texture and taste. It’s a match that turns a simple sponge into a standout cake, perfect for teatime or any celebration.

Ingredients for the Perfect Coffee Walnut Cake Recipe

Essential Cake Ingredients and Their Roles

To create a coffee walnut cake that’s rich, fluffy, and moist, you need high-quality ingredients in the right proportions. Here’s what goes into the sponge:

• Unsalted Butter (225g): Adds moisture and richness. Soften it before use for easier mixing and a smoother texture.
• Caster Sugar (225g): Sweetens the cake without overpowering the coffee flavor. It also helps the sponge brown beautifully.
• Free-Range Eggs (4, large): Bind the ingredients and give structure. Beaten eggs work best when added gradually to avoid curdling.
• Instant Coffee (1 tbsp, dissolved in 1 tbsp boiling water): Delivers a bold coffee flavor. Dissolving it ensures even mixing into the batter.
• Self-Raising Flour (225g): Provides lift and structure. It’s pre-mixed with leavening agents, simplifying the recipe.
• Chopped Walnuts (75g): Give texture and nutty flavor. Lightly toast for an even deeper taste if desired.

Each ingredient plays a key part in achieving a balanced, light sponge with a strong yet smooth coffee-walnut profile.

What Makes the Buttercream Special

The buttercream frosting in a coffee walnut cake recipe isn’t just a topping—it ties the whole flavor experience together. Here’s what you’ll need:

• Butter (175g, softened): The base of a creamy, rich icing. Use high-quality butter for the best taste.
• Icing Sugar (300g): Sweetens the buttercream and gives it a silky texture. Sift it for a lump-free result.
• Instant Coffee Paste (3 tbsp coffee mixed with 1 tbsp boiling water): Intensifies the coffee hit in the icing. The paste form ensures smooth blending.
• Chopped Walnuts (50g): Mixed into the icing for extra crunch and flavor consistency.
• Walnut Halves (12): For topping and decoration. These add a classic look and an inviting crunch on top.

Getting the right balance of icing to sponge is key. This recipe ensures just enough buttercream to sandwich the layers and decorate the top without overwhelming the Coffee Walnut Cake.

Coffee Walnut Cake Recipe

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• Author: Olivia
• Total Time: 60 minutes
• Yield: 12 servings 1x
• Diet: Vegetarian

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Description

A moist and fluffy British classic, this Coffee Walnut Cake recipe blends rich coffee flavor with crunchy walnuts, layered with silky coffee buttercream.

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Ingredients

Scale 1x2x3x

225g unsalted butter, softened

225g caster sugar

4 large free-range eggs, beaten

1 tbsp instant coffee granules, mixed with 1 tbsp boiling water

225g self-raising flour

75g chopped walnuts

For the Buttercream Icing:

175g butter, softened

300g icing sugar

3 tbsp instant coffee granules, mixed with 1 tbsp boiling water

50g chopped walnuts

12 walnut halves

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Instructions

1. Preheat oven to 180°C/gas mark 4. Grease and line two 8-inch sandwich tins.

2. Cream butter and sugar until light and fluffy using a hand-held whisk.

3. Gradually add eggs with a spoonful of flour, beating well to avoid curdling.

4. Stir in remaining flour, coffee, and chopped walnuts. Mix gently.

5. Divide batter evenly into tins. Bake for 20–25 minutes until golden and risen.

6. Cool in tins for 2 minutes, then turn onto wire racks to cool completely.

7. Make buttercream: beat butter and icing sugar until fluffy, add coffee paste and chopped walnuts.

8. Chill buttercream for 15–20 minutes to firm up.

9. Spread half the buttercream on one cake layer, top with the second sponge.

10. Spread remaining buttercream on top and decorate with walnut halves.

Notes

For deeper flavor, lightly toast the walnuts before chopping.

Use decaf instant coffee if serving to children or those avoiding caffeine.

Always ensure cakes are completely cool before icing to avoid melting.

• Prep Time: 20 minutes
• Cook Time: 25 minutes
• Category: Cakes
• Method: Baking
• Cuisine: British

Nutrition

• Serving Size: 1 slice
• Calories: 480
• Sugar: 35g
• Sodium: 180mg
• Fat: 30g
• Saturated Fat: 13g
• Unsaturated Fat: 14g
• Trans Fat: 0g
• Carbohydrates: 49g
• Fiber: 1.5g
• Protein: 5g
• Cholesterol: 110mg

Step-by-Step Instructions for Baking Coffee Walnut Cake

Preparing the Cake Batter Properly

The foundation of a perfect coffee walnut cake lies in how you prepare the batter. Even simple steps, if rushed or skipped, can affect the cake’s texture and rise.

1. Preheat the Oven
   Set your oven to 180°C or gas mark 4. Grease and line two 8-inch (20 cm) round sandwich tins with baking paper to prevent sticking.
2. Cream the Butter and Sugar
   Use a hand-held whisk to beat 225g of softened unsalted butter and 225g of caster sugar until light and fluffy. This step incorporates air, helping the cake rise evenly.
3. Incorporate the Eggs and Flour Gradually
   Beat in 4 large eggs, one at a time. Add a tablespoon of the 225g self-raising flour with each egg to prevent curdling. Mix thoroughly after each addition to create a smooth batter.
4. Add Coffee and Walnuts
   Stir in the remaining flour, the dissolved instant coffee (1 tbsp coffee with 1 tbsp boiling water), and 75g of chopped walnuts. Mix until just combined to avoid overworking the batter.

Baking Tips and Techniques for Even Results

To ensure a perfect bake:

• Divide Batter Evenly
  Pour the mixture into the two prepared tins, smoothing the tops with a spatula.
• Bake with Care
  Place both tins in the center of the oven. Bake for 20 to 25 minutes, or until the Coffee Walnut Cake are well-risen and golden brown. A toothpick should come out clean from the center when done.
• Cool Properly
  Let the cakes sit in the tins for 2 minutes before turning them out onto a wire rack. Cooling them completely prevents the buttercream from melting during assembly.

Creating a Fluffy Coffee Buttercream Icing

Making the Coffee Icing Paste

The flavor of the buttercream in a coffee walnut cake needs to be bold but smooth. Here’s how to make the coffee base for your icing:

• Mix 3 tablespoons of instant coffee granules with 1 tablespoon of boiling water.
• Stir until the granules fully dissolve and form a thick coffee paste.
• Let it cool slightly before adding to the butter mixture. Warm paste can cause the icing to split.

Using a paste rather than liquid coffee concentrates the flavor without thinning the texture, which helps the buttercream stay firm and spreadable.

Blending and Applying the Perfect Buttercream

Now let’s build that fluffy, delicious frosting:

1. Cream the Butter and Sugar
   Beat 175g of softened butter with 300g of icing sugar until light and pale. A stand or hand mixer speeds this up and creates a smoother finish.
2. Add the Coffee Paste
   Once the butter and sugar are well combined, mix in the prepared coffee paste. Beat for another 2 to 3 minutes until fully incorporated.
3. Add Chopped Walnuts
   Stir in 50g of finely chopped walnuts. These add texture and ensure the nutty flavor runs through every bite.
4. Let the Buttercream Rest
   Place the buttercream in the fridge for 15–20 minutes. This firms it slightly, making it easier to use when sandwiching the cake layers and topping the Coffee Walnut Cake.

Assembling and Decorating the Coffee Walnut Cake

Sandwiching the Layers with Precision

Once your Coffee Walnut Cake are completely cool and your buttercream has firmed up, it’s time to build your showstopper:

1. Choose the Flattest Sponge for the Base
   Place one of the cooled cakes on a serving plate or cake stand, bottom-side down for stability.
2. Spread the Filling Evenly
   Use half of your prepared coffee buttercream to cover the surface of the bottom cake. Spread it evenly with a spatula or the back of a spoon, working from the center outward. The layer should be thick enough to taste but not so much that it squeezes out when topped.
3. Add the Second Layer
   Gently place the second cake on top, bottom-side up for a smooth surface. Press lightly to set it in place, but don’t push too hard to avoid cracking.

Garnishing with Walnuts for a Classic Finish

The decoration doesn’t just make the Coffee Walnut Cake look appealing, it completes the flavor and texture experience:

• Top with the Remaining Buttercream
  Spread the rest of the coffee buttercream over the top cake layer. For a rustic look, create swoops and waves with a palette knife. For a cleaner style, smooth it flat.
• Add Walnut Halves
  Arrange 12 walnut halves in a circle on top of the buttercream, evenly spaced. They add crunch and give the cake a traditional appearance.
• Optional Touches
  For extra texture, sprinkle crushed walnuts around the edge or press some into the sides of the cake for a more layered nut finish.

At this point, your cake is ready to serve or store. It’s a timeless centerpiece for any dessert table.

Pro Tips for Enhancing Your Coffee Walnut Cake

Ingredient Substitutions for Dietary Needs

If you or your guests have specific dietary preferences or restrictions, there are several easy swaps that keep the flavor intact:

• Dairy-Free Option
  Swap the butter in both the sponge and buttercream with a high-quality plant-based alternative. Make sure it’s suitable for baking and not overly salty.
• Egg-Free Version
  Replace each egg with 1 tablespoon of ground flaxseed mixed with 3 tablespoons of water. Let it sit for 5 minutes before adding to your batter.
• Gluten-Free Adaptation
  Use a 1:1 gluten-free self-raising flour blend. Add 1/2 tsp of xanthan gum to improve structure if your mix doesn’t include it.
• Low-Sugar Variation
  Reduce the caster sugar slightly (no more than 20%), or use a baking-friendly sugar substitute like stevia. Keep in mind, changing the sugar ratio can affect texture and browning.

These simple swaps allow more people to enjoy this classic Coffee Walnut Cake without compromising taste or consistency.

Common Mistakes to Avoid

Even experienced bakers run into trouble if they rush or overlook key steps. Here are a few pitfalls to steer clear of:

• Overmixing the Batter
  Once the flour goes in, mix just until combined. Overmixing activates the gluten and can make your sponge dense or rubbery.
• Using Cold Ingredients
  Cold eggs and butter can cause the batter to curdle or result in uneven mixing. Bring all ingredients to room temperature before starting.
• Underbaking or Overbaking
  Always test your Coffee Walnut Cake with a skewer. If it comes out clean, your cake is done. Avoid opening the oven door too early—it causes the cake to sink.
• Skipping the Cooling Time
  Buttercream melts quickly on warm cake layers. Always wait until the sponges are completely cool before decorating.
• Uneven Layering
  Use a digital scale to divide your batter equally between tins. This ensures an even bake and a neater final assembly.

Variations of the Coffee Walnut Cake Recipe

Vegan or Egg-Free Coffee Walnut Cake

Whether you’re avoiding animal products or simply out of eggs, this variation keeps all the flavor with none of the compromise.

• Egg Substitutes: Use flax eggs—1 tbsp ground flaxseed mixed with 3 tbsp water per egg. Let the mix sit for 5–10 minutes before adding it to the batter.
• Dairy Alternatives: Replace the butter with plant-based margarine or dairy-free baking spread. Opt for unsweetened almond or oat milk if your variation includes liquid.
• Check Your Icing Sugar: Some brands include animal-based agents, so choose a certified vegan product to keep the buttercream fully plant-based.

These adjustments yield a sponge that’s moist and flavorful, ideal for serving guests with dietary concerns.

Mini Cupcake and Loaf Alternatives

Want to make individual servings or something more sliceable for lunches or small plates? Try these fun format options:

• Coffee Walnut Cupcakes
  Divide the batter into lined muffin tins and bake for 15–18 minutes. Top each cupcake with a dollop of coffee buttercream and a walnut half for a mini version of the classic.
• Coffee Walnut Loaf Cake
  Pour the batter into a greased 2lb loaf pan. Bake for about 40–45 minutes. This version is great for slicing and serving at brunch or packing for on-the-go treats.
• Bundt Cake Twist
  Grease a small bundt pan and reduce the buttercream to just a drizzle of coffee icing or glaze. Perfect for a fancier look with less effort.

Each format gives your favorite coffee walnut cake recipe a fresh look and feel while maintaining its signature flavor.

Serving Suggestions and Storage Advice

Ideal Beverage Pairings and Serving Ideas

A coffee walnut cake is already rich in flavor, so pairing it with the right drink or presentation style can elevate the experience:

• Coffee or Espresso: The obvious but perfect match. Serve with a hot cup of black coffee or a cappuccino for full flavor harmony.
• Tea Time Favorite: Pair with English breakfast or Earl Grey tea. The light tannins balance the sweetness of the buttercream.
• Fresh Cream on the Side: For an extra indulgent touch, offer lightly whipped cream with a hint of vanilla.
• Sliced Fruit Garnish: Serve with fresh berries or a few orange slices for color and a tangy contrast.
• Dessert Platter: Slice into smaller squares and include on a dessert board with chocolate pieces, dates, and nuts.

Cut the Coffee Walnut Cake with a warm, sharp knife for clean slices, especially if it’s been chilled before serving.

How to Store Coffee Walnut Cake to Keep It Fresh

Proper storage keeps your Coffee Walnut Cake moist and delicious for several days. Here’s how to do it:

Avoid storing near strong-smelling foods. The buttercream can absorb odors, which may affect taste.

Conclusion

The coffee walnut cake recipe is a timeless bake that delivers bold flavor, moist texture, and satisfying crunch in every bite. Whether you’re a seasoned baker or a weekend kitchen explorer, this recipe is easy to follow and endlessly rewarding. With rich coffee notes and the nutty depth of walnuts, it’s a classic that never goes out of style.

From carefully balancing ingredients to mastering the buttercream and assembling your layers with care, every step brings you closer to a cake that’s perfect for teatime, birthdays, or a cozy dessert moment. Thanks to its versatility, you can adapt it for dietary needs, bake it in various formats, and keep it fresh for days.

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