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 very tender.
Drain the onions in a colander and pass them through it with a spoon.
Transfer the onion puree to a clean saucepan.
Finish the sauce
Add a piece of butter, a little coarse sea salt, and ½ cup of cream.
Stir over the fire 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
- Provide the main body and sweet flavour of the sauce once cooked and pureed.
- Butter
- Adds richness and a smooth mouthfeel to the sauce.
- Cream
- Adds richness and body, helping the sauce become smooth and thick.
The step that matters
Stir over the fire until the sauce thickens. Heat must be moderate and stirring constant, because the cream and butter can scorch or split if overheated. Stirring keeps the puree evenly heated so it thickens smoothly rather than sticking to the pan.
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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