Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓
Mocha Tart
Ingredients
Directions
The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the sponge
Preheat the oven to 400°F (200°C).
Beat the egg yolks and granulated sugar until very light.
Add the Mocha extract, flour, and baking powder; mix well.
In a separate bowl, beat the egg whites until frothy and fold them into the mixture.
Bake and fill
Divide the batter into three tins and bake for 5 to 8 minutes.
For the filling, whip the cream until stiff and sweeten with sugar to taste; add the Mocha extract.
Ice and finish
For the icing, mix the confectioners' sugar with the Mocha extract and add water gradually until the desired consistency is reached.
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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Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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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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Flour + creamtop 20% of all pairsSmell alikemoderateCooked together30,481 recipes
Shared aroma: acetaldehyde (pungent, ethereal).
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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Egg and flour barely smell alike, yet cooks put them together in 106,462 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
- Whipped whites and yolks trap air, giving the sponge its light, airy structure.
- All-purpose flour
- Forms the gluten network that sets the sponge's crumb once baked.
- Baking powder
- Releases gas in the batter, helping the sponge rise in the oven.
- Granulated sugar
- Sweetens the sponge and helps stabilise the whipped egg foam.
- Heavy cream
- Whipped into stiff peaks, it adds moisture and richness to the filling.
The step that matters
Folding the egg whites into the mixture. Whites hold air only when whipped to frothy foam; overmixing or deflating them while folding loses the air that lifts the sponge, leaving it dense.
“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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