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 ↓
Spanish Onion
Ingredients
Directions
Prepare
Cut the onion in half and reserve small portions of the center for salad.
Parboil the remaining onion halves in water for 10 minutes and save the water.
Chop the parboiled onion into small pieces.
Cook
In a saucepan, melt the butter and add the chopped onion.
Cook until the onion is soft and translucent.
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
- Onion
- Forms the main body of the dish and turns soft and sweet as it cooks.
- Butter
- Adds fat and richness, helping the onion soften gently in the pan.
The step that matters
Parboiling the onion halves. Parboiling partly softens the onion before it is cooked in butter, so it reaches a tender texture without burning. Saving the cooking water keeps some onion flavor for later use.
“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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