Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓
Citron Cake
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the batter
Cream together the sugar and butter until light and fluffy.
Add the milk and mix well.
Beat the egg whites in a separate bowl.
Beat the egg yolks in a separate bowl.
Combine the beaten whites and yolks into the mixture.
Stir in the vanilla or lemon extract.
Sift the baking powder with the flour.
Gradually add the sifted mixture to the batter.
Fold in the sliced citron.
Bake
Divide the batter into two prepared cake tins lined with buttered parchment paper.
Bake at 350°F (175°C) until a toothpick inserted in the center comes out clean.
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.
Photo for illustrative purposes only · Contact us to use it
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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Milk + vanillatop 5% of all pairsSmell alikemoderateCooked together19,187 recipes
Shared aroma: ethyl caproate (fruity, apple peel).
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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Sugar + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Vanilla + flourtop 12% of all pairsSmell alikemoderateCooked together19,241 recipes
Shared aroma: isobutyraldehyde (malty, green).
Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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
- Eggs
- Whites trap air for lift, while yolks add richness and help bind the crumb.
- Butter
- Creamed with sugar, it traps air and adds tenderness and richness to the crumb.
- All-purpose flour
- Its gluten and starch form the cake's structure as the batter sets in the oven.
- Baking powder
- Releases gas in the batter, making the cake rise and become light.
- White sugar
- Sweetens the cake and, creamed with butter, helps create a light, aerated batter.
- Citron
- Adds candied fruit flavor and chewy pieces throughout the cake.
The step that matters
Folding in the beaten whites and adding the flour mixture. Overmixing after the flour goes in develops gluten and deflates the air from the whites, producing a tough, dense cake instead of a light one.
Swap the vanilla
How well each one fits the dish's main ingredients (sugar, butter, milk, egg, flour):
- Vanillathe original
- Raisinfits about as well
- Figfits less well
- Coconutfits less well
Fit is the average pairing score against sugar, butter, milk, egg, 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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