Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Walnut 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
Preheat the oven to 350°F (175°C).
In a mixing bowl, cream together the butter and sugar.
Add the eggs and mix well.
Combine the cocoa powder with a little milk, then add it to the mixture.
Stir in the flour, baking powder, and walnuts until well combined.
Bake and finish
Pour the batter into a shallow cake tin.
Bake in the preheated oven until a toothpick comes out clean.
Let the cake cool, then ice with water icing and top with halved walnuts.
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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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + walnuttop 12% of all pairsSmell alikemoderateCooked together5,873 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + cocoa powdertop 13% of all pairsSmell alikemoderateCooked together2,244 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Sugar + cocoa powdertop 14% of all pairsSmell alikemoderateCooked together2,920 recipes
Shared aroma: guaiacol (smoky, sweet).
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Butter + cocoa powdertop 14% of all pairsSmell alikemoderateCooked together2,130 recipes
Shared aroma: 2,3-pentanedione (butter, sweet).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Creamed with sugar to trap air and give the cake a tender, rich crumb.
- Eggs
- Bind the batter and add structure and richness as the cake sets in the oven.
- All-purpose flour
- Forms the cake's main structure once it sets during baking.
- Baking powder
- Releases gas in the batter so the cake rises and becomes light.
- Walnuts
- Add texture and a nutty flavor that contrasts with the soft crumb.
The step that matters
Bake until a toothpick comes out clean. Underbaking leaves wet batter in the centre that can collapse as it cools, while overbaking dries the crumb. A toothpick test checks that the structure has set without drying the cake.
Swap the walnut
How well each one fits the dish's main ingredients (flour, sugar, butter, cocoa powder, egg):
- Almondfits better
- Hazelnutfits better
- Pistachiofits about as well
- Walnutthe original
Fit is the average pairing score against flour, sugar, butter, cocoa powder, egg. 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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