Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Apple Jelly Cake
Ingredients
Directions
Make the batter
Cream together the butter and sugar.
Add the egg yolks and mix well.
Stir in the milk, baking powder, and flour until combined.
Make the filling
In a separate pot, combine the grated apples, lemon juice and peel, sugar, and beaten egg.
Boil the apple mixture, stirring constantly, until thick.
Cool the filling and use it to fill the cake layers.
Bake
Bake the cake in layers until golden.
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 + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Milk + appletop 11% of all pairsSmell alikemoderateCooked together4,104 recipes
Shared aroma: 4-heptenal (creamy, biscuit).
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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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Milk + flourtop 14% of all pairsSmell alikelowCooked together78,219 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 and give the cake a tender, rich crumb.
- Eggs
- Yolks add richness and structure; the beaten egg thickens the apple filling as it cooks.
- Flour
- Forms the cake's structure once its proteins set in the oven.
- Baking powder
- Releases gas during baking so the cake rises and becomes light.
- Apples
- Provide moisture, tartness, and bulk to the filling once cooked down.
- Sugar
- Sweetens the cake and the filling and helps the filling thicken into a jelly-like texture.
The step that matters
Boil the apple mixture until thick. Stirring constantly prevents the egg and sugar from scorching or curdling on the pan base, and the filling only sets to a spreadable jelly once it has reached a thick consistency. Cooling fully before filling keeps the layers from soaking or sliding.
Swap the apple
How well each one fits the dish's main ingredients (butter, sugar, egg, milk, flour, lemon):
- Vanillafits better
- Raisinfits better
- Figfits better
- Applethe original
Fit is the average pairing score against butter, sugar, egg, milk, flour, 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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