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Onion Omelet

A simple omelet flavored with chopped onion and minced parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Onion and parsley are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 25,843 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓

Onion Omelet

Ingredients

Directions

  1. Make a plain omelet with the eggs.

  2. When ready to turn, spread the chopped onion and minced parsley over the omelet.

  3. Fold the omelet and serve.

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

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

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

    Shared aroma: decanal (soap, orange peel).

  3. Parsley + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together28,563 recipes

    Shared aroma: trans-2-hexenal (green, leafy).

  4. Egg + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

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

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

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Eggs
Form the main structure of the omelet as they set when cooked.
Chopped onion
Adds savory flavor and a bit of aroma to the omelet.
Minced parsley
Adds fresh, herbal aroma and a touch of color.

The step that matters

Spread the onion and parsley when ready to turn. Adding the fillings after the eggs have set on the bottom but while the top is still slightly wet keeps the omelet tender. If added too early the vegetables may release moisture, and if added too late they will not warm through before folding.

Swap the onion

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

  1. Shallotfits better
  2. Chivefits better
  3. Leekfits better
  4. Onionthe original

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