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Eggs and Onions

Poached eggs served over browned onions with cayenne and lemon.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 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 ↓

Eggs and Onions

Ingredients

Directions

Prepare the onions

  1. Fry the sliced onions in butter until nicely browned, about 5 minutes.

  2. Sprinkle cayenne pepper over the onions.

  3. Drain the onions and place them on a dish to dry slightly.

  4. Press the lemon juice over the onions.

Poach and serve

  1. Poach the eggs for 3 to 4 minutes.

  2. Lay the poached eggs on top of the onions and serve hot.

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

Onions
Browning in butter builds a sweet, savoury base for the dish.
Eggs
Provide the main protein; their set white and runny yolk form the topping.
Butter
Carries heat for frying and adds richness and browning to the onions.
Lemon juice
Adds acidity that brightens the rich onions and eggs.

The step that matters

Poach the eggs for 3 to 4 minutes. Eggs poached too long lose their runny yolk and turn firm, while too short leaves the white unset. Timing controls how the protein coagulates, so watch the whites closely.

Swap the onion

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

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

Fit is the average pairing score against butter, pepper, 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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