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Egg Sandwiches

A sandwich made with mashed hard‑boiled eggs, mustard, salt, pepper, melted butter, and chopped egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

Egg Sandwiches

Ingredients

Directions

Make the filling

  1. Mash the yolks of the hard boiled eggs with mustard, salt, pepper, and melted butter.

  2. Add the chopped egg whites just before assembling the sandwiches.

Assemble and serve

  1. Spread the mixture between thin slices of bread.

  2. Cut into desired shapes and serve.

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. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

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

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

  5. Pepper + breadtop 16% of all pairs
    Smell alikemoderate
    Cooked together20,964 recipes

    Shared aroma: 2-nonenal (fatty, green).

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 yolks mashed smooth and whites added chopped for texture.
Mustard
Adds sharp, tangy flavour that cuts through the richness of the egg yolks.
Melted butter
Adds fat and moisture, making the mashed yolk filling smoother and richer.

The step that matters

Add the chopped egg whites just before assembling. Chopped whites added too early can release moisture and loosen the filling, making the sandwiches soggy as they sit. Adding them last keeps the texture firmer and the bread less wet.

Swap the mustard

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

  1. Capsicumfits better
  2. Asparagusfits better
  3. Chivefits better
  4. Mustardthe original

Fit is the average pairing score against egg, pepper, butter, 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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