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Eggs and Onions

Poached eggs served over sautéed Spanish onion, seasoned with cayenne, salt, and lemon.

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 ↓

Eggs and Onions

Ingredients

Directions

Cook the onion

  1. Slice the onion and fry it in butter until light brown and tender, avoiding burning.

  2. Drain the butter and place the fried onion on a dish.

Season and serve

  1. Sprinkle cayenne pepper and salt over the onions, then squeeze the juice of the lemon on top.

  2. Poach the eggs and serve them on top of the onion.

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

Onion
Softens and sweetens as it fries, forming the savoury base of the dish.
Butter
Fries the onion gently and adds richness and browning.
Eggs
Set when poached, providing the soft, rich topping for the onions.
Lemon
Adds acidity that brightens the rich onion and egg flavours.

The step that matters

Fry the onion without burning. Slow frying in butter softens the onion and browns its sugars gently. High heat can scorch the sugars and make the butter taste bitter, so the onion should be stirred and watched until light brown and tender.

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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