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Onion Omelet

A quick omelet flavored with onion, parsley, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓

Onion Omelet

Ingredients

Directions

Prepare

  1. Beat the eggs in a bowl and season with salt and pepper.

  2. Heat a non-stick skillet over medium heat.

Cook and serve

  1. Pour the eggs into the skillet and cook until the edges begin to set.

  2. Sprinkle the chopped onion and minced parsley over the omelet.

  3. Fold the omelet in half and cook for another minute until fully set.

  4. 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 their aromas overlap, and how often cooks already put them together.

  1. Parsley + peppertop 2% of all pairs
    Smell alikestrong
    Cooked together34,122 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  2. Onion + parsleytop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

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

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

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

  4. Egg + parsleytop 21% of all pairs
    Smell alikemoderate
    Cooked together18,765 recipes

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

  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
Proteins set with heat to form the omelet's structure and tender body.
Chopped onion
Adds savory aroma and flavor to the eggs as it cooks.

The step that matters

Cooking the eggs until the edges just set. Egg proteins tighten quickly under heat. Cooking too long or on high heat makes the omelet tough and rubbery, so the eggs should be removed from the heat while the centre is still slightly soft.

Swap the onion

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

  1. Carrotfits better
  2. Capsicumfits better
  3. Spinachfits better
  4. Onionthe original

Fit is the average pairing score against egg, parsley, 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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