Coffee and walnut cake is a British tea-room classic: a light, coffee-flavoured sponge studded with chopped walnuts, sandwiched and topped with a silky coffee buttercream and crowned with walnut halves. This is a straightforward how-to, with ingredients, ratios and numbered steps. One thing to settle first, because it confuses people: this is a genuinely coffee-flavoured cake, not the American streusel "coffee cake" that contains no coffee at all.
What is coffee and walnut cake?
It is a creamed Victoria-style sponge with two flavour additions baked in: real coffee and chopped walnuts. The coffee goes into both the cake batter and the buttercream, so the flavour runs all the way through. It is a fixture of afternoon tea and church-fete cake stalls, and it pairs beautifully with a cup of black tea or a milky latte.
Do not confuse it with the dish many readers know as "coffee cake." The published coffee cake recipe is the American crumb-topped streusel cake that has no coffee in it at all; it is named that way because it is eaten with coffee. Our cake here is the opposite: the coffee is the star ingredient. If you came looking for the cinnamon-streusel kind, follow that link instead.
Ingredients for a classic coffee and walnut cake
This makes a two-layer 20 cm (8 inch) round cake that serves about ten. The sponge uses an equal-weight ratio of butter, sugar and self-raising flour to eggs, the same balance behind a Victoria sponge.
| Component | Ingredient | Amount |
|---|---|---|
| Sponge | Softened unsalted butter | 225 g (8 oz) |
| Sponge | Caster (superfine) sugar | 225 g (8 oz) |
| Sponge | Self-raising flour | 225 g (8 oz) |
| Sponge | Baking powder | 1 tsp |
| Sponge | Large eggs | 4 |
| Sponge | Chopped walnuts | 100 g (about 1 cup) |
| Coffee flavour | Instant coffee or espresso powder | 2 tbsp |
| Coffee flavour | Boiling water (to make a paste) | 1 tbsp |
| Coffee flavour | or 1 shot strong espresso, cooled | ~30 ml |
| Buttercream | Softened unsalted butter | 175 g (6 oz) |
| Buttercream | Icing (powdered) sugar, sifted | 350 g (12 oz) |
| Buttercream | Strong coffee (as above) | 2 tsp coffee + 1 tbsp water |
| Decoration | Walnut halves | 8-10 |
If you only have plain (all-purpose) flour, add 2 teaspoons of baking powder instead of 1 to compensate for the missing raising agent.
How to make coffee and walnut cake step by step
- Prep. Heat the oven to 180 C / 350 F (160 C fan / gas 4). Grease two 20 cm sandwich tins and line the bases with parchment. Stir the 2 tablespoons of coffee into 1 tablespoon of boiling water to make a thick, dark paste, then let it cool. Reserve a teaspoon for the buttercream.
- Cream. Beat the butter and caster sugar together until pale and fluffy, about 3-4 minutes. This air is what lifts the sponge, so do not rush it.
- Add eggs. Beat in the eggs one at a time, adding a spoonful of the flour with each to stop the mixture splitting (curdling).
- Fold. Sift in the remaining flour and baking powder and fold gently. Fold in the cooled coffee paste and the chopped walnuts. Stop as soon as it is even; over-mixing toughens the crumb.
- Bake. Divide between the two tins and level the tops. Bake for 20-25 minutes, until well risen, golden and springy, and a skewer inserted in the centre comes out clean.
- Cool. Cool in the tins for 10 minutes, then turn out onto a rack and cool completely. Warm sponge melts buttercream, so be patient.
- Make the buttercream. Beat the soft butter until creamy, then add the sifted icing sugar a third at a time. Beat in the reserved coffee until smooth and spreadable.
- Assemble. Spread a third of the buttercream over one sponge, sit the second on top, and swirl the rest over the surface. Arrange the walnut halves around the edge.
How to get a strong coffee flavour without a wet batter
The classic mistake is pouring in a mug of brewed coffee to taste it more. That adds liquid without much flavour and gives you a dense, damp sponge. The fix is concentration. Dissolve instant coffee or espresso powder in just a tablespoon of hot water to make a thick paste, or use a single shot of real espresso reduced and cooled. Both deliver deep coffee flavour with almost no extra moisture. Instant coffee is the most reliable here precisely because it is already dehydrated, so a little carries a lot of flavour. Whichever you use, taste the paste; it should be assertively bitter, because baking and the sweet buttercream will mellow it.
Variations and easy swaps
- Loaf or traybake. Bake the same batter in a lined loaf tin (about 45-55 minutes at 160 C fan) or a single rectangular tin, then ice only the top. Handy when you want one cake rather than a layer cake.
- Simple glaze. Skip the buttercream and drizzle over a coffee glaze: sift icing sugar and stir in just enough strong coffee to make a pourable icing. Lighter and faster.
- Toast the walnuts. Dry-toast the chopped walnuts in a pan for a few minutes before folding them in. It deepens their flavour and adds crunch.
- Vegan / egg-free. Use a plant butter and non-dairy milk, swap the eggs for a tested replacer (such as yogurt or flaxseed-and-water "eggs"), and lean on self-raising flour with extra baking powder for lift.
- Nut-free. Leave the walnuts out entirely for a plain coffee sponge, or replace them with toasted seeds.
Doneness and storage
The cake is done when it is springy to a light press, just shrinking from the sides of the tin, and a skewer comes out clean. If the top browns fast but the centre is wobbly, the oven runs hot; lower it slightly and give it a few more minutes. Store the finished coffee and walnut cake in an airtight container somewhere cool for three to four days. The buttercream actually keeps the crumb moist. To get ahead, freeze the un-iced sponges, well wrapped, for up to three months and ice them once thawed.
A cake worth the cupboard staples
Coffee and walnut is one of those flavour pairings that never goes out of style, and the recipe asks for nothing exotic: butter, sugar, eggs, flour, walnuts and a spoonful of coffee you almost certainly already have. Master this version and you can spin it into cupcakes, a loaf or a glazed traybake without learning anything new. Brew something good to go alongside it, pull the strongest shot you can for that buttercream, and let the cake do the rest.