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Egg Sandwiches

A sandwich made with mashed hard‑boiled egg yolks mixed with mustard, salt, pepper, vinegar, and egg whites, served on stale bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Mustard and vinegar are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Egg Sandwiches

Ingredients

Directions

Make the filling

  1. Remove the yolks from the hard boiled eggs and mash them until smooth.

  2. Mix in the mustard, salt, pepper, and enough vinegar to moisten the mixture.

  3. Add the thinly sliced egg whites to the yolk mixture.

Assemble

  1. Spread the mixture between thin slices of slightly stale bread.

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.

  1. Mustard + vinegartop 7% of all pairs
    Smell alikemoderate
    Cooked together14,067 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Egg + breadtop 13% of all pairs
    Smell alikemoderate
    Cooked together22,662 recipes

    Shared aroma: (e)-2-octenal (fatty, green).

  4. Pepper + vinegartop 14% of all pairs
    Smell alikemoderate
    Cooked together27,814 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  5. Mustard + breadtop 16% of all pairs
    Smell alikemoderate
    Cooked together1,484 recipes

    Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).

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

What each ingredient does

Hard boiled eggs
Provide the main filling, with mashed yolks giving a creamy base and sliced whites adding texture.
Mustard
Adds sharp, pungent flavour that cuts through the richness of the egg yolks.
Vinegar
Adds acidity and moisture, brightening the flavour of the yolk mixture.
Slightly stale bread
Provides the sandwich base; slightly dry bread holds the moist filling without going soggy.

The step that matters

Moistening the yolk mixture with vinegar. Yolks mash into a dense paste that can turn dry or crumbly. Adding vinegar a little at a time moistens the mixture evenly without making it watery, so it spreads well and stays soft in the sandwich.

Swap the mustard

How well each one fits the dish's main ingredients (egg, pepper, vinegar, bread):

  1. Capsicumfits better
  2. Mustardthe original
  3. Cucumberfits about as well
  4. Shallotfits about as well

Fit is the average pairing score against egg, pepper, vinegar, bread. 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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