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Omelette a l’Oignon

A French onion omelette made with browned onions, milk, eggs, butter, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Omelette a l’Oignon

Ingredients

Directions

Prepare the onions

  1. Slice the onions and brown them in butter.

  2. Once browned, moisten the onions with milk and season with salt and pepper.

Make and cook the omelette

  1. Beat the eggs in a bowl and mix in the onion mixture.

  2. Fry the mixture in a hot pan until cooked through.

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

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

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

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

  3. Onion + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  4. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  5. Milk + eggtop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 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

Eggs
Set and bind the mixture into a tender, cohesive omelette when heated.
Onions
Add sweetness and savory depth when browned in butter.
Butter
Adds richness and helps the onions brown in the pan.
Milk
Moistens the onions and adds softness to the cooked eggs.

The step that matters

Fry the mixture in a hot pan until cooked through. Egg proteins set with heat, so a pan that is too cool can leave the omelette wet, while excessive heat can make it tough and rubbery.

Swap the onion

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

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

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