Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
Potato Salad
Ingredients
Directions
Prepare the potatoes
Boil the potatoes with skins on, then peel and slice them into quarters.
Combine the sliced potatoes, onions, and parsley in a salad dish.
Make the dressing
In a small skillet, heat the vinegar, mustard, salt, and pepper until hot but not boiling.
Beat the egg yolks and olive oil together, then stir in the milk.
Combine the egg mixture with the hot vinegar mixture until thickened like cream, but do not boil.
Assemble
Pour the dressing over the salad and mix well.
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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Parsley + peppertop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Potato + oniontop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + parsleytop 5% of all pairsSmell alikemoderateCooked together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Cider + vinegartop 6% of all pairsSmell alikemoderateCooked together3,431 recipes
Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Thicken the dressing as they set gently with heat, giving it a creamy body.
- Cider vinegar
- Adds acidity that sharpens the dressing and balances the rich egg yolks.
- Sliced cold boiled potatoes
- Form the bulk of the salad and absorb the dressing's flavour.
- Olive oil
- Adds fat that enriches the dressing and gives it a smooth mouthfeel.
- Prepared mustard
- Adds sharpness and helps emulsify the dressing.
The step that matters
Combine the egg mixture with the hot vinegar mixture until thickened like cream, but do not boil.. Egg yolks thicken through gentle heat, around the point where their proteins set. Boiling or overheating them can curdle the dressing into grainy lumps and loss of smoothness.
Swap the onion
How well each one fits the dish's main ingredients (potato, parsley, cider, vinegar, mustard, pepper, egg):
- Horseradishfits better
- Shallotfits better
- Broccolifits better
- Onionthe original
Fit is the average pairing score against potato, parsley, cider, vinegar, mustard, 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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