Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Bordelaise Sauce
Ingredients
Directions
Combine the brown sauce, onion juice, and claret in a saucepan.
Season with salt and pepper.
Cook over low heat for 20 minutes, stirring occasionally.
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.
Photo for illustrative purposes only · Contact us to use it
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 + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Sauce + oniontop 19% of all pairsSmell alikelowCooked together10,474 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Sauce + peppertop 27% of all pairsSmell alikelowCooked together15,303 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Sauce and onion barely smell alike, yet cooks put them together in 10,474 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
- Brown sauce
- Forms the rich, savory body of the sauce, giving it most of its volume and flavor.
- Claret
- Adds acidity and wine flavor, which balances the richness of the brown sauce as it reduces.
- Onion juice
- Adds a sharp, aromatic onion flavor that deepens the savory character of the sauce.
The step that matters
Cooking over low heat for 20 minutes, stirring occasionally. Gentle heat lets the wine's alcohol evaporate and the sauce thicken and concentrate slowly. Stirring prevents scorching on the bottom of the pan, which would give a burnt taste.
Swap the onion
How well each one fits the dish's main ingredients (sauce, pepper):
- Capsicumfits better
- Tomatofits better
- Mustardfits better
- Onionthe original
Fit is the average pairing score against sauce, pepper. 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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