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Eggs a LA Lucerne

A dish of eggs cooked with onion, flour, milk, and seasoned with pepper and salt, served over hot buttered toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Flour and egg are a kitchen classic. They rank in the top 8% of all ingredient pairs, and 104,138 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. The science ↓

The recipe

Ingredients

Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)

Directions

Make the sauce

  1. Fry the onion until soft.

  2. Pass the fried onion through a sieve.

  3. Mix the flour with the milk until smooth.

  4. Add the flour‑milk mixture to the onion.

  5. Season with pepper and salt.

  6. Stir over low heat for about seven minutes.

Finish and serve

  1. Beat the eggs well.

  2. Stir the beaten eggs into the milk and onion mixture.

  3. Prepare hot buttered toast.

  4. Pour the egg mixture over the toast.

  5. Serve immediately.

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 aroma chemistry they share, and how many recipes mention both.

  1. Flour + eggtop 8% of all pairs
    Aroma overlaplow
    Mentioned together104,138 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Onion + peppertop 6% of all pairs
    Aroma overlapmoderate
    Mentioned together68,463 recipes

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

  3. Flour + milktop 8% of all pairs
    Aroma overlaplow
    Mentioned together76,993 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Milk + eggtop 9% of all pairs
    Aroma overlapmoderate
    Mentioned together88,465 recipes

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

  5. Onion + milktop 11% of all pairs
    Aroma overlapstrong
    Mentioned together13,411 recipes

    Shared aroma: hexanal (green, grassy).

Flour and egg share little aroma chemistry, yet 104,138 recipes mention both: they likely 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
Set into a soft, creamy custard when gently heated, thickening the sauce.
Flour
Thickens the milk into a smooth sauce that holds the eggs together.
Milk
Forms the liquid base of the sauce and keeps the eggs tender.
Onion
Adds savoury sweetness and aroma to the sauce once softened.

The step that matters

Stir over low heat for about seven minutes. Eggs thicken from gentle heat, and high heat can curdle them into grainy lumps. Keeping the heat low and stirring constantly gives a smooth, spoonable sauce.

Flavor stand-ins for the onion

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

  1. Capsicumbetter flavor fit
  2. Potatobetter flavor fit
  3. Asparagusbetter flavor fit
  4. Onionthe original

Fit is the average pairing score against flour, milk, pepper, egg. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).

“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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