Instructions
- 1
Beat butter and sugar. Add eggs. Mix in dissolved espresso.
- 2
Alternate flour-baking powder and sour cream. Fold in chopped walnuts.
- 3
Bake in 3 layers at 350°F for 28-30 minutes. Cool completely.
- 4
Make coffee buttercream: beat butter fluffy. Add powdered sugar and espresso. Beat 5 minutes until very pale.
- 5
Spread buttercream between layers.
- 6
Apply final coat all over exterior. Smooth sides.
- 7
Drizzle coffee ganache over the top edge to create dramatic drips.
- 8
Place walnut halves in a pattern on top.
Baker's Tip
Use instant espresso powder, not brewed coffee — instant dissolves completely without adding extra liquid which would thin the batter. The intensity of instant espresso gives a much more pronounced coffee flavor in both the cake and the buttercream.
Frequently Asked Questions
Can I use brewed espresso instead of instant espresso powder?
Yes but reduce other liquids by the same amount to maintain batter consistency. Reduce 3 tablespoons of brewed espresso to half by simmering until concentrated, then cool before using. Instant powder is easier and gives more consistent results.
How do I toast walnuts properly?
Spread on a baking sheet, bake at 350°F for 8-10 minutes, shaking once, until fragrant and slightly darkened. Watch carefully — walnuts go from toasted to burnt in 60 seconds. Cool completely before chopping. Toasting removes bitterness and adds a deep nutty flavor.
My coffee buttercream tastes too sweet — how do I fix it?
Add a pinch of salt and an extra tablespoon of espresso. Alternatively add 2 tablespoons of unsweetened cream cheese to balance the sweetness. The salt alone does a remarkable job of cutting perceived sweetness without any other changes.
Is this recipe good for people who do not like strong coffee?
Reduce the espresso powder by half for a milder coffee note. The cake will still have a pleasant warm flavor without being overtly coffee-forward. You can also add 1 teaspoon of vanilla to balance and round the coffee flavor for more universal appeal.
About This Recipe
A quintessentially British coffee and walnut cake elevated to three elegant layers — coffee-soaked sponge, coffee buttercream swirled with walnut praline, finished with a glossy coffee glaze and toasted walnut halves. Sophisticated and deeply satisfying.
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