Why it works: Onion and olive are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 29,779 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓
Hot Tartar Sauce
Ingredients
Directions
Make the sauce base
Boil the onion in the vinegar for a few minutes.
Add the butter and egg yolks, then beat until thick, about 1 minute.
Finish the sauce
Remove from heat and gradually beat in the olive oil.
Add salt, cayenne, and minced gherkin.
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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Onion + olivetop 8% of all pairsSmell alikemoderateCooked together29,779 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Vinegar + olivetop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Olive + peppertop 11% of all pairsSmell alikemoderateCooked together30,263 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Vinegar + oniontop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsify and thicken the sauce as they set with gentle heat.
- Olive oil
- Adds richness and body as it is beaten into the emulsion.
- Butter
- Adds fat and smoothness, helping the yolks thicken evenly.
- Vinegar
- Adds sharp acidity that cuts the richness of the yolks and fat.
The step that matters
Beat the yolks until thick over heat. Egg yolks thicken as their proteins set, but too much heat can scramble them. Beating steadily keeps the sauce smooth and thick rather than grainy.
Swap the onion
How well each one fits the dish's main ingredients (vinegar, butter, olive, pepper, egg):
- Capsicumfits better
- Tomatofits better
- Cucumberfits better
- Onionthe original
Fit is the average pairing score against vinegar, butter, olive, pepper, egg. 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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