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 ↓
Impromptu 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.
Prepare the cake batter
Preheat your oven to 350°F (175°C).
Cream together the butter and 2 cups of sugar.
Add the yolks of the eggs and mix well.
Fold in the beaten egg whites and flour until combined.
Make the jelly
For the jelly, combine the grated apple, lemon rind, lemon juice, 1 cup of sugar, and 1 egg in a saucepan.
Boil the mixture, stirring constantly, until it jellies.
Cool the jelly before using.
Bake and assemble
Bake the cake in jelly-cake pans or in thin layers.
Spread the jelly between each layer as you assemble the 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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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Butter + appletop 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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Flour + eggtop 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
- Butter
- Creams with sugar to trap air, giving the cake a tender, rich crumb.
- Eggs
- Yolks add richness and beaten whites lift the batter and help set its structure.
- Flour
- Provides the structure that holds the cake's crumb together as it bakes.
- Sugar
- Sweetens the cake and helps create a tender texture when creamed with butter.
- Grated apple
- Supplies pectin and moisture that help the apple-lemon filling thicken into jelly.
- Lemon
- Adds acidity and aroma, and its juice and rind help the jelly set.
The step that matters
Boil the jelly until it sets. Stirring constantly prevents the egg and sugar from scorching on the pan base. The mixture must reach a full boil to thicken properly, since pectin and egg proteins set as they cool.
Swap the apple
How well each one fits the dish's main ingredients (butter, sugar, flour, egg, lemon):
- Raisinfits better
- Vanillafits better
- Figfits better
- Applethe original
Fit is the average pairing score against butter, sugar, flour, egg, lemon. 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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