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Egg and Onion Sandwiches

A sandwich made with fried eggs, toasted bread, and sliced Bermuda onions.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Egg and bread are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 22,662 recipes. Both carry (e)-2-octenal, which smells fatty, green. The science ↓

Egg and Onion Sandwiches

Ingredients

Directions

Prepare

  1. Heat two skillets on the stove.

  2. Slice Bermuda onions into thin pieces.

Cook

  1. Fry the desired number of eggs in one skillet.

  2. Fry enough slices of bread in the other skillet.

Assemble and serve

  1. Place a hot slice of bread on a plate.

  2. Top with a fried egg and a slice of onion.

  3. Add another slice of fried bread on top and serve hot.

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

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

  2. Bread + oniontop 15% of all pairs
    Smell alikemoderate
    Cooked together8,676 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  3. Egg + oniontop 34% of all pairs
    Smell alikelow
    Cooked together23,333 recipes

    Shared aroma: 2,4-decadienal (seaweed).

Egg and onion barely smell alike, yet cooks put them together in 23,333 recipes: they work on texture and structure more than aroma.

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

What each ingredient does

Eggs
The white sets to a firm layer while the yolk stays soft, adding richness and moisture.
Bread
Frying gives the slices a crisp, browned surface that holds up under the egg.
Bermuda onions
Thin slices add mild sweetness and a sharp bite that contrasts with the rich egg.

The step that matters

Frying the eggs. High heat makes the whites tough, rubbery, and browned at the edges before the yolk is ready. Moderate heat lets the whites set gently while the yolk stays runny, which keeps the sandwich moist.

Swap the onion

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

  1. Asparagusfits better
  2. Leekfits better
  3. Shallotfits better
  4. Onionthe original

Fit is the average pairing score against egg, 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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