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Mocha Hazelnut Cake

A proper teatime cake – dark and dense and topped with crunchy toasted hazelnuts. It'll keep in a tin for up to 5 days, or you can freeze it

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Why it works: Chocolate and hazelnut work together. They rank in the top 3% of all ingredient pairs, and 350 recipes mention both. Both carry 2-acetyl-1-pyrroline, which smells popcorn, roasted. The science ↓

The recipe

Cuts into 12 slices
Prep25 min

Ingredients

Contains: egg, milk, wheat, tree nuts (auto-detected from the ingredients and method; we can miss things, so check labels)

Directions

Method written by CompKitchen from the ingredient list. Not the original author's method, not kitchen-tested.

  1. Preheat the oven to 180°C (350°F). Line a 20cm (8 inch) round cake tin with baking paper.

  2. Toast the 50g hazelnuts in a dry pan over medium heat for 3 to 4 minutes, shaking often, until golden. Cool, then roughly chop.

  3. Melt the 150g plain chocolate with the 4 tbsp coffee in a bowl set over a pan of barely simmering water, stirring until smooth. Let it cool slightly.

  4. Beat the 175g softened butter and 175g caster sugar until pale and fluffy. Gradually beat in the 5 lightly beaten eggs, adding a spoonful of the flour if the mixture curdles.

  5. Stir in the cooled chocolate mixture. Fold in the 100g ground hazelnuts, 100g self-raising flour and 1 tsp baking powder until just combined.

  6. Spoon the mixture into the tin and level the top. Bake for 30 to 35 minutes until risen, springy and a skewer inserted in the centre comes out clean. Cool 10 minutes in the tin, then turn onto a rack to cool completely.

  7. For the icing, melt the 100g plain chocolate, 50g butter and 3 tbsp coffee over a pan of barely simmering water, stirring until smooth. Remove from the heat and let cool slightly.

  8. Stir the 4 tbsp double cream and 50g icing sugar into the chocolate icing. Leave for 10 to 15 minutes until thick enough to spread.

  9. Spread the icing over the top of the cooled cake, scatter with the toasted chopped hazelnuts, and cut into 12 slices.

By bbcgoodfood. Recipe from Open Recipes.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much aroma chemistry they share, and how many recipes mention both.

  1. Chocolate + hazelnuttop 3% of all pairs
    Aroma overlapmoderate
    Mentioned together350 recipes

    Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).

  2. Chocolate + coffeetop 2% of all pairs
    Aroma overlapstrong
    Mentioned together1,497 recipes

    Shared aroma: 2,3-butanedione (buttery, creamy).

  3. Butter + creamtop 3% of all pairs
    Aroma overlapstrong
    Mentioned together41,494 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

  4. Coffee + hazelnuttop 4% of all pairs
    Aroma overlapmoderate
    Mentioned together86 recipes

    Shared aroma: 2-ethyl-3,5-dimethylpyrazine (roasted, earthy).

  5. Chocolate + creamtop 5% of all pairs
    Aroma overlapmoderate
    Mentioned together5,463 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs