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Lyonnaise Eggs

A baked dish of eggs in a creamy onion sauce topped with breadcrumbs and butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 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 ↓

Lyonnaise Eggs

serves 6
Oven, in the book's wordsA hot oven

Ingredients

Directions

The book says “a hot oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Make the sauce

  1. In a saucepan, melt the butter over low heat and add the onion juice; cook for 5 minutes.

  2. Stir in the flour until well mixed, then gradually add the milk, stirring until thickened.

  3. Season the sauce with salt and pepper, then pour it into a baking dish.

Bake and serve

  1. Break the eggs onto the sauce, sprinkle with bread crumbs, and dot with butter.

  2. Bake in a 400°F (200°C) oven for 3 to 4 minutes until the eggs are set.

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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  3. Milk + breadtop 11% of all pairs
    Smell alikemoderate
    Cooked together11,466 recipes

    Shared aroma: 2-undecenal (sweet).

  4. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

  5. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

Butter
Enriches the sauce's flavor and adds richness to the topping for gentle browning.
Flour
Thickens the milk into a smooth sauce that holds the eggs.
Milk
Forms the liquid base of the sauce, which thickens as it heats.
Eggs
Set in the hot sauce to form the soft, cooked centre of the dish.
Bread crumbs
Add a crisp, lightly browned topping over the baked eggs.

The step that matters

Baking until the eggs are just set. Eggs turn firm and rubbery when overcooked, while undercooked whites stay runny. Checking for a set white with a soft yolk keeps the texture tender.

Swap the onion

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

  1. Capsicumfits better
  2. Asparagusfits better
  3. Potatofits better
  4. Onionthe original

Fit is the average pairing score against butter, flour, milk, pepper, 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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