Why it works: Onion and butter are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 42,912 recipes. Both carry decanal, which smells soap, orange peel. The science ↓
Onions, Plain, Boiled
Ingredients
Directions
Prepare
Peel the onions.
Boil them gently in salted water for 5 to 6 minutes.
Drain the onions and soak them in cold water for 1 hour.
Cook and serve
Place the onions in a saucepan with plenty of cold water.
Simmer gently until tender, without breaking them.
Serve on a hot dish with melted butter poured over.
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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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Spanish onions
- Provide the main body of the dish, becoming soft and sweet when simmered until tender.
- Melted butter
- Adds richness and fat, coating the onions with a smooth finish when poured over.
The step that matters
Simmer gently until tender, without breaking them. Vigorous boiling can make the outer layers of the onions break apart before the centre softens. Gentle heat cooks the onion evenly while keeping its structure intact.
“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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