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 ↓
Fried Onions
Ingredients
Directions
Prepare
Peel the onions and slice them under cold water.
Drain and dry the slices on a clean cloth.
Cook and serve
In a frying pan, heat hot lard and add an equal amount of butter.
Cook the onions until tender and brown, turning with a fork to avoid burning.
Season with coarse sea salt just before serving.
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
- Onions
- Provide the main body and sweetness as they soften and caramelize in the fat.
- Lard
- Conducts heat evenly and adds richness so the onions brown without sticking.
- Butter
- Adds fat and a toasty, rounded flavor that complements the browned onions.
The step that matters
Cooking the onions until tender and brown. Browning depends on steady moderate heat and frequent turning. Too little heat steams the onions, while too much scorches the sugars before the centers soften, leaving them 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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