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Egg Sandwiches

A sandwich made with mashed hard‑boiled eggs mixed with mustard, salt, pepper, vinegar, and egg whites, spread between buttered 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 rub them smooth.

  2. Season the yolks with French mustard, salt, pepper, and vinegar to stiffen.

  3. Add the finely chopped egg whites and mix well.

Assemble

  1. Spread the mixture between slices of buttered 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
Yolks form a rich, creamy base, and chopped whites add body and texture to the filling.
French mustard
Adds sharp flavour and helps the mashed yolks hold together smoothly.
Vinegar
Adds acidity that brightens the rich egg flavour and sharpens the filling.
Buttered bread
Provides a firm base that holds the filling and adds contrast in texture.

The step that matters

Rub the yolks smooth before adding the whites. Mashing the yolks until fine gives an even, creamy texture. Lumps of dry yolk would not blend with the seasoning and would make the filling crumbly.

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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