Why it works: Parsley and capers match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,550 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Boiled Shad with Egg Sauce
Ingredients
Directions
Prepare the fish
Sew the shad in a piece of thin muslin or mosquito-netting.
Boil water with vinegar added, then cook the shad for 10 minutes per pound.
Clip the threads, unwrap the shad carefully, and place it on a serving dish.
Make the egg sauce
Whip the raw egg into the hot drawn butter to make the sauce.
Stir in the chopped hard-boiled egg, minced parsley, and capers.
Set the sauce over boiling water for 5 minutes, stirring often.
Serve.
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 + caperstop 1% of all pairsSmell alikestrongCooked together1,550 recipes
Shared aroma: coumarin (sweet, hay).
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Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
-
Butter + caperstop 16% of all pairsSmell alikemoderateCooked together1,637 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Vinegar + parsleytop 16% of all pairsSmell alikemoderateCooked together6,477 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Vinegar + caperstop 16% of all pairsSmell alikemoderateCooked together1,453 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
- Shad
- The main fish, cooked whole and wrapped so it holds its shape while boiling.
- Raw egg
- Whisked into the hot butter, it thickens and emulsifies the sauce into a smooth, body-rich texture.
- Drawn butter
- Provides the fat base and rich flavour for the sauce.
- Hard-boiled egg
- Adds texture and a mild, savoury body to the sauce.
The step that matters
Setting the sauce over boiling water. Heating the egg-and-butter mixture gently and stirring often lets the raw egg thicken smoothly. Too much heat or too little stirring can scramble the egg and leave the sauce grainy.
Swap the capers
How well each one fits the dish's main ingredients (vinegar, butter, egg, parsley):
- Tarragonfits better
- Capersthe original
- Dillfits about as well
- Thymefits about as well
Fit is the average pairing score against vinegar, butter, egg, parsley. 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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