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.
Add the eggs and mix well.
Stir in the cold water.
Gradually add the flour and baking powder, mixing until smooth.
Divide the batter into three greased cake tins and bake until golden.
Make the lemon jelly
For the jelly, combine ¾ cup sugar, 1 egg, lemon juice, and grated rind in a bowl.
Cook the mixture over steam until thickened.
If using, add the grated sour apple and adjust sugar to 1 cup.
Assemble
Layer the baked cakes with the lemon jelly.
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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Butter + appletop 14% of all pairsSmell alikemoderateCooked together8,706 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
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
- Eggs
- Bind the batter and help give the cake its structure as they set in the oven.
- Butter
- Adds fat and richness, contributing to a tender crumb and flavour.
- Flour
- Forms the main structure of the cake as its proteins set during baking.
- Baking powder
- Releases gas during baking so the cake rises and becomes light.
- Sugar
- Sweetens the cake and helps it brown while tenderising the crumb.
- Lemon
- Provides the acidity and aroma that flavour the jelly filling.
The step that matters
Cook the lemon jelly over steam until thickened. Egg-based fillings set as the proteins coagulate with gentle heat. Overheating or cooking too fast can curdle the eggs, so the jelly stays smooth only with slow, steady steam heat.
Swap the apple
The recipe marks apple as optional. How well each one fits the dish's main ingredients (sugar, butter, egg, flour, lemon):
- Raisinfits better
- Vanillafits better
- Figfits better
- Applethe original
Fit is the average pairing score against sugar, butter, egg, 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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