Why it works: Walnut and lemon match in chemistry and in kitchens. They rank in the top 10% of all ingredient pairs, and cooks put them together in 2,149 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Chocolate Cake
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Combine 1 cup shaved chocolate and 1 tablespoon hot water in a bowl.
Place the mixture in a warm area until melted.
Line a cake tin with oiled paper.
Make the batter
Add the yolks of 5 eggs and beat until stiff.
Mix in 1 cup granulated sugar and beat again.
Stir in 1 cup walnut meal and 1 tablespoon lemon juice.
Gently fold in 1 cup sifted flour.
Fold in the stiffly beaten whites of 5 eggs.
Bake
Pour the batter into the tin.
Bake at 350°F (175°C) for 35 to 45 minutes.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
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Walnut + lemontop 10% of all pairsSmell alikestrongCooked together2,149 recipes
Shared aroma: 2-nonenal (fatty, green).
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Chocolate + walnuttop 10% of all pairsSmell alikemoderateCooked together1,548 recipes
Shared aroma: 3-ethyl-2,5-dimethylpyrazine (roasted, nutty).
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Walnut + flourtop 12% of all pairsSmell alikemoderateCooked together5,873 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Chocolate + sugartop 13% of all pairsSmell alikemoderateCooked together15,404 recipes
Shared aroma: guaiacol (smoky, sweet).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Shaved chocolate
- Melts into the batter to give the cake its chocolate flavour and rich, moist crumb.
- Egg yolks
- Add richness and moisture and help bind the batter.
- Egg whites
- Whipped to hold air, giving the cake lift and a light, open texture.
- Granulated sugar
- Sweetens the batter and helps give the cake a tender crumb.
- Walnut meal
- Adds body and a nutty flavour, giving a denser, moist crumb.
- Sifted flour
- Provides structure that sets as the cake bakes.
The step that matters
Folding in the stiffly beaten egg whites. The whites hold the air that lifts the cake. Stirring or folding too hard knocks that air out, leaving a flat, dense cake.
Swap the lemon
How well each one fits the dish's main ingredients (chocolate, egg, sugar, walnut, flour):
- Vanillafits better
- Raisinfits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against chocolate, egg, sugar, walnut, flour. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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