Why it works: Butter and flour 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 ↓
Lemon Jelly 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 cake
Preheat the oven to 350°F (175°C).
Cream together the sugar and butter until light and fluffy.
Add the cold water and egg, mixing well.
Combine the flour and baking powder, then gradually add the dry mixture to the wet mixture, mixing until just combined.
Divide the batter into layers and bake until golden.
Make the lemon jelly and assemble
Combine the grated lemon rind, lemon juice, sugar, and egg in a double boiler.
Cook, stirring constantly, until thick enough to spread.
Cool the lemon jelly before spreading it between the layers of cake.
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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Creams with sugar to trap air, giving the cake a tender, fine crumb.
- Eggs
- Add structure and richness, helping bind the batter and set the crumb as it bakes.
- All-purpose flour
- Forms the cake's structure when mixed with liquid and gluten develops.
- Baking powder
- Releases gas during baking so the layers rise and become light.
- Sugar
- Sweetens the cake and, creamed with butter, helps create a light texture.
- Lemon juice
- Adds acidity and bright flavor to the lemon jelly, which also thickens as it cooks.
The step that matters
Cook the lemon jelly until thick, stirring constantly. Eggs in the jelly can scramble or curdle if overheated or left unstirred. Gentle, constant stirring in a double boiler cooks the egg gradually and lets the mixture thicken smoothly into a spreadable filling.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, butter, egg, flour):
- Raisinfits better
- Vanillafits better
- Figfits about as well
- Lemonthe original
Fit is the average pairing score against sugar, butter, 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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