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 ↓
Onion Butter
Ingredients
Directions
Slice the onion and fry it in butter over medium heat until shrivelled and brown.
Strain the mixture through a wire strainer into a small jar with a tight lid.
Discard the onion solids.
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
- White onion
- Browns in the butter, releasing sweet, savoury flavour into the fat.
- Butter
- Carries the onion flavour and becomes the spreadable fat once strained.
The step that matters
Frying the onion until brown. Frying until the onion is shrivelled and brown lets its sugars caramelise, building deeper flavour. Stopping too early leaves the butter tasting raw and mild, while over-browning can make it bitter.
“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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