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Onion Omelet

A quick omelet flavored with onion, parsley, salt, and pepper, cooked in butter or oil.

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. In a bowl, beat the eggs and season with salt and pepper.

  2. Heat butter or oil in a skillet over medium heat.

Cook the omelet

  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.

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

    Shared aroma: decanal (soap, orange peel).

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

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

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

What each ingredient does

Eggs
Set into the structure of the omelet as they cook, giving it body and a tender texture.
Chopped onion
Adds savory flavor and a little sweetness as it softens in the heat.
Minced parsley
Adds fresh, grassy aroma and a bit of color to the finished omelet.

The step that matters

Fold the omelet while the edges are only set. Egg proteins firm as they heat, so folding too early can tear the soft center, while cooking too long makes the eggs rubbery and dry. Stopping once fully set keeps the texture tender.

Swap the onion

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

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

Fit is the average pairing score against egg, parsley, pepper, 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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