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Onion and Eggs

A dish of sautéed onion slices topped with poached eggs and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Onion and Eggs

Ingredients

Directions

Prepare the onion

  1. Wash and peel the onion, then slice it into ¼-inch thick slices.

  2. Sprinkle salt and pepper over the onion slices.

Cook the onion

  1. Fry the slices in hot butter until tender but not browned.

  2. Use an egg slicer to lift the onion slices and drain them from the fat.

  3. Place the drained onion slices on a hot dish.

  4. Squeeze lemon juice over the onions.

Serve

  1. Top the onions with the poached eggs and 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. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

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

  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 + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

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

    Shared aroma: decanal (soap, orange peel).

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

What each ingredient does

Spanish onion
Forms the base of the dish, turning tender and sweet when fried gently in butter.
Butter
Fat that carries heat to the onion slices, helping them soften and take on flavor.
Lemon juice
Adds acidity that brightens the sweet, rich onion and eggs.
Poached eggs
Provide richness and a soft, runny yolk that coats the onions when cut.

The step that matters

Fry the onion until tender but not browned. Frying over moderate heat softens the onion's cell walls and draws out sweetness. High heat or long cooking causes browning, which adds bitterness and changes the mild flavor the dish depends on.

Swap the onion

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

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

Fit is the average pairing score against pepper, butter, lemon, 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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