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 the onions, remove the tops and roots, and cut them in half.
Place the onions in cold water, then cover with more water and boil until tender.
Drain the onions and press out excess water.
Chop the onions finely and rub them through a sieve.
Make the sauce
In a saucepan, melt the butter, add the chopped onions, and mix in the cream or milk and salt.
Bring the sauce to a boil and serve hot.
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
- Large white onions
- Provide the main body and sweet flavor of the sauce once boiled and sieved.
- Butter
- Adds richness and fat, carrying flavor and giving the sauce a smooth mouthfeel.
- Cream or milk
- Adds moisture and creaminess, loosening the purée into a smooth, pourable sauce.
The step that matters
Rub the onions through a sieve. Pressing the cooked onions through a sieve breaks down fibers and removes lumps, which gives the sauce its smooth texture. Chopping finely first helps the onion pass through without clogging.
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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