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Omelette a l’Ognon

A French-style omelette flavored with sautéed onions, butter, eggs, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Omelette a l’Ognon

Oven, in the book's wordsA very hot oven

Ingredients

Directions

Prepare the filling

  1. Cut the onion into dice.

  2. Fry the onion in hot butter until soft but not brown.

Make the omelette

  1. Drain the fat and mix the onion with the lightly beaten eggs.

  2. Season with salt and pepper.

  3. Fry the omelette in an omelette pan.

Serve

  1. Serve with or without a white sauce.

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

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

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

    Shared aroma: decanal (soap, orange peel).

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

    Shared aroma: decanal (soap, orange peel).

  4. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  5. Egg + peppertop 33% of all pairs
    Smell alikelow
    Cooked together50,580 recipes

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

Egg and pepper barely smell alike, yet cooks put them together in 50,580 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
Set when cooked, forming the body of the omelette.
Butter
Fat for frying that carries flavour and keeps the onion from sticking.
Spanish onion
Softened in butter to add sweetness and savoury depth to the filling.

The step that matters

Fry the onion until soft but not brown. Onion that browns turns bitter and sharp, and it can scorch in the butter. Cooking it gently softens its cell structure and draws out sweetness, so it blends smoothly into the egg.

Swap the onion

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

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

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