Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
English Sauce for Salad, Cold Meat, or Cold Fish
Ingredients
Directions
Prepare the yolks
Boil eggs for at least fifteen minutes, keep them covered with water, and let them become quite cold before removing shells.
Break up the yolks and mash them into a paste with a wooden spoon.
Make the dressing
Add a small saltspoonful of salt, a few grains of fine cayenne, and a teaspoonful of cold water; mix well.
Gradually stir in a quarter of a pint of sweet cream, then a tablespoonful of strong chili vinegar, and enough common or French vinegar to acidulate the mixture.
Optionally, replace the cream with six tablespoonsful of olive oil, adding it in small portions and stirring briskly until the sauce resembles custard; omit water if using oil.
Add optional ingredients such as eschalot vinegar, Harvey’s sauce, anchovy essence, French mustard, tarragon vinegar, or bruised garlic.
Variation
For a variation, combine two well‑boiled potatoes (passed through a sieve), a teaspoonful of mustard, two teaspoonsful of salt, one teaspoon of anchovy essence, a quarter teaspoon of very finely‑chopped onions, three tablespoonsful of oil, one teaspoon of vinegar, and the yolks of two hard‑boiled eggs; stir thoroughly before serving.
Nutrition, whole recipe (rough)
Counts 10 of 11 ingredients. The other 1 aren't in our nutrition table and add nothing above, so the real totals are higher.
What these numbers assume: 10 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Potato | 1 medium (173g) baked | 161 |
| Olive Oil | 1 tbsp (14g) | 119 |
| Egg | 1 large egg (50g) | 78 |
| Cream | 1 tbsp (15ml) heavy | 51 |
| Onion | 1 medium (110g) | 44 |
| Chili | 1 tsp (2.7g) | 8 |
| Cayenne | 1 tsp (1.8g) | 6 |
| Vinegar | 1 tbsp (15ml) distilled | 3 |
| Mustard | 1 tsp (5g) yellow | 3 |
| Salt | 1 tsp (6g) | 0 |
| Water | not in our table | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
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. See the original page.
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.
-
Onion + potatotop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Mustard + oniontop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Olive + potatotop 7% of all pairsSmell alikemoderateCooked together6,458 recipes
Shared aroma: 2-undecenal (sweet).
-
Mustard + potatotop 7% of all pairsSmell alikemoderateCooked together1,340 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Cooked yolks mash into a paste that thickens and emulsifies the dressing.
- Sweet cream
- Adds richness and body, giving the dressing a smooth, creamy texture.
- Olive oil
- Fat that emulsifies into the yolks, thickening the sauce to a custard-like texture.
- Vinegar
- Adds acidity that sharpens flavour and balances the richness of the yolks and fat.
The step that matters
Adding the oil or cream gradually. Fat must be added slowly and stirred briskly so it emulsifies into the yolk paste; adding it all at once can split the sauce and prevent it thickening smoothly.
Swap the potato
How well each one fits the dish's main ingredients (cream, vinegar, mustard, onion, olive, egg):
- Horseradishfits better
- Chivefits better
- Lettucefits better
- Potatothe original
Fit is the average pairing score against cream, vinegar, mustard, onion, olive, 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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