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
Boil large onions in plenty of water until tender.
Drain the onions in a colander.
Pass the drained onions through the colander with a spoon.
Make the sauce
In a saucepan, combine the onion puree with a good piece of butter, a little coarse sea salt, and ½ cup of cream.
Stir over the heat until the sauce thickens.
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 onions
- Form the base of the sauce, providing the main flavour and body once pureed.
- Butter
- Adds richness and a smooth, silky mouthfeel to the sauce.
- Cream
- Adds richness and body, helping the sauce thicken into a smooth consistency.
The step that matters
Stir over the heat until the sauce thickens. Cream and butter can separate or scorch if overheated, so gentle, constant stirring over moderate heat keeps the sauce smooth and evenly thickened.
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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