Why it works: Onion and butter are a kitchen classic. They rank in the top 15% of all ingredient pairs, and 42,912 recipes mention both. Both carry decanal, which smells soap, orange peel. The science ↓
Onion Soup a LA Cressy
Ingredients
Directions
Clean and slice the onions.
In a stewpan, melt the butter and add the onions and sugar.
Cook the onions until they are soft and jam-like.
Serve hot.
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 aroma chemistry they share, and how many recipes mention both.
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Onion + buttertop 15% of all pairsAroma overlapmoderateMentioned together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + sugartop 17% of all pairsAroma overlapmoderateMentioned together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
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Onion + sugartop 36% of all pairsAroma overlaplowMentioned together15,747 recipes
Shared aroma: guaiacol (smoky, sweet).
Onion and sugar share little aroma chemistry, yet 15,747 recipes mention both: they likely 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
- Onions
- Form the main body of the soup and, when cooked slowly, turn soft and jam-like with sweetness.
- Fresh butter
- Carries the onions in the pan and adds richness and fat for a smooth texture.
- Sugar
- Helps the onions brown and caramelise, adding sweetness that balances their sharpness.
The step that matters
Cook the onions until soft and jam-like. Onions must cook low and slow so their moisture evaporates and their sugars caramelise gradually. Rushing this leaves them sharp and pale instead of sweet and deeply flavoured.
“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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