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 lemon jelly
Combine grated lemon, brown sugar, egg, and grated apple in a saucepan and boil for five minutes.
Set aside to use as jelly.
Make the cake
Cream butter and white sugar together in a mixing bowl.
Add beaten egg yolks, then flour, then lemon juice and rind, and mix until smooth.
Butter a cake tin and pour the batter to a thickness of ¼ inch.
Bake and assemble
Bake in a preheated oven at 350°F until light brown.
Once baked, layer the cakes with lemon jelly in between.
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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Lemon + appletop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + buttertop 14% of all pairsSmell alikemoderateCooked together8,706 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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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).
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
- Flour
- Forms the main structure of the cake as its proteins set during baking.
- Butter
- Adds richness and a tender crumb by coating flour and creaming with sugar.
- Eggs
- Add structure and richness, with the yolks enriching the batter and binding it.
- White sugar
- Sweetens the cake and helps create a tender texture when creamed with butter.
- Lemon
- Provides acidity and bright lemon aroma to both the cake and the jelly.
- Apple
- Adds moisture and body to the lemon jelly filling as it cooks.
The step that matters
Bake until light brown. Removing the cakes at the right moment matters: underbaking leaves the crumb wet and fragile, while overbaking dries it out and makes it crumbly.
Swap the apple
How well each one fits the dish's main ingredients (lemon, sugar, egg, butter, flour):
- Raisinfits better
- Vanillafits better
- Figfits better
- Applethe original
Fit is the average pairing score against lemon, sugar, egg, butter, 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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