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 ↓
Raspberry Sandwich
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Make the batter
Whisk the eggs and sugar together until well combined.
Melt the butter and mix the flour with the baking powder.
Gently stir the flour mixture into the egg and sugar mixture.
Spread the batter in a well-greased flat tin.
Bake and assemble
Bake in a moderate oven at 350°F (175°C) until golden.
Once cooled, split the cake, spread raspberry jam between the layers, and sprinkle with fine sugar.
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 + raspberrytop 16% of all pairsSmell alikemoderateCooked together1,308 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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
- Provide structure and lift as they trap air when whisked with sugar.
- Butter
- Adds richness and tenderness, and helps the crumb stay soft.
- Flour
- Forms the cake's structure once it sets in the oven.
- Baking powder
- Releases gas in the oven so the batter rises and becomes light.
- Raspberry jam
- Adds sweetness, moisture and fruity acidity between the layers.
The step that matters
Gently stir the flour mixture into the egg and sugar mixture. Vigorous stirring develops gluten in the flour, which makes the cake tough. Folding gently keeps the air whisked into the eggs, so the sponge stays light.
Swap the raspberry
How well each one fits the dish's main ingredients (egg, butter, sugar, flour):
- Raisinfits better
- Vanillafits better
- Figfits better
- Raspberrythe original
Fit is the average pairing score against egg, butter, sugar, 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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