Why it works: Butter and cream are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 41,516 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓
Onion Sauce
Ingredients
Directions
Prepare the onions
Peel and halve the onions, then soak them in spring water for 15 minutes.
Boil the onions in water until tender, about 30 to 60 minutes.
Drain the onions well and chop them finely.
Make the sauce
In a saucepan, combine the chopped onions with butter and flour.
Add salt and stir in cream or milk until it reaches your desired consistency.
Heat until it boils, then serve with boiled rabbits, mutton, or tripe.
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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Butter + creamtop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Onion + creamtop 18% of all pairsSmell alikelowCooked together10,827 recipes
Shared aroma: 2-nonanone (fruity, floral).
Onion and cream barely smell alike, yet cooks put them together in 10,827 recipes: they 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
- White onions
- Form the bulk of the sauce and add mild sweetness once cooked until tender.
- Butter
- Adds richness and fat, carrying flavour and giving the sauce a smooth mouthfeel.
- Cream or milk
- Adds moisture and creaminess, loosening the sauce to your desired consistency.
The step that matters
Drain the onions well. Excess cooking water dilutes the sauce and thins the butter base, so the onions must be drained thoroughly before chopping and combining. Fine chopping lets them blend evenly into a cohesive sauce.
Swap the onion
How well each one fits the dish's main ingredients (butter, cream):
- Potatofits about as well
- Onionthe original
- Leekfits about as well
- Chivefits less well
Fit is the average pairing score against butter, cream. Candidates are from the same food group and used in at least 100 recipes.
“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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