Name: Egg Farci
Ingredients: hard-boiled eggs; cold cooked chicken or veal, finely chopped; butter or mayonnaise; salt and pepper to taste; lemon juice; mustard; cayenne

Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Egg Farci

Ingredients

Directions

Prepare the eggs

Cut hard‑boiled eggs in half crosswise and remove the yolks.
Set the egg whites aside in pairs.

Make the filling

Mash the yolks and mix in an equal amount of finely chopped cold cooked chicken or veal.
Moisten the mixture with butter or mayonnaise.
Season with salt, pepper, lemon juice, mustard, and cayenne to taste.

Assemble

Refill the egg whites with the yolk mixture.

Recipe from a historical cookbook (Internet Archive).

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.

Pepper + lemontop 3% of all pairs

Smell alikestrong

Cooked together27,047 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Pepper + mustardtop 9% of all pairs

Smell alikemoderate

Cooked together15,430 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Lemon + mustardtop 11% of all pairs

Smell alikestrong

Cooked together3,816 recipes

Shared aroma: eucalyptol (eucalyptus, herbal).
Chicken + mustardtop 13% of all pairs

Smell alikemoderate

Cooked together2,192 recipes

Shared aroma: gamma-nonanolactone (coconut, creamy).
Chicken + buttertop 15% of all pairs

Smell alikemoderate

Cooked together13,902 recipes

Shared aroma: 2-furfurylthiol (coffee, roasted).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Hard-boiled eggs: Whites form the shell and yolks become the creamy base of the filling.
Cold cooked chicken or veal: Adds substance and savoury body to the yolk filling.
Butter or mayonnaise: Adds fat and moisture so the yolk mixture becomes smooth and spreadable.
Lemon juice: Adds acidity that brightens the rich yolk filling.
Mustard: Adds sharpness and aroma that balance the richness of the yolks.

Swap the mustard

How well each one fits the dish's main ingredients (egg, chicken, butter, pepper, lemon):

Capsicumfits better
Asparagusfits better
Spinachfits better
Mustardthe original

Fit is the average pairing score against egg, chicken, butter, pepper, lemon. 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.