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Liver and Onions

Thin-sliced liver cooked with onions, seasoned with salt and pepper, served hot.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Pepper and onion are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Liver and Onions

Ingredients

Directions

Prepare

  1. Heat a generous amount of salted lard or frying oil in two frying pans.

  2. Wash the liver slices in cold water and dry them thoroughly.

Cook

  1. Place the liver slices in one frying pan, season with salt and pepper, cover, and cook over medium‑high heat, turning the slices once while cooking.

  2. In the second frying pan, add the sliced onions, season with salt and pepper, and stir frequently until cooked.

Serve

  1. Once cooked, serve the liver on a platter with the onions heaped over and around it.

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 + oniontop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Liver + oniontop 15% of all pairs
    Smell alikelow
    Cooked together1,420 recipes

    Shared aroma: furaneol (caramel, strawberry).

  3. Liver + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together2,375 recipes

    Shared aroma: 2-nonenal (fatty, green).

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

What each ingredient does

Liver
Its protein sets and firms when cooked, giving the slices a tender but structured bite.
Onions
Softened by stirring, they turn sweet and mellow, balancing the rich flavour of the liver.
Salted lard or frying oil
Conducts heat to the pan and helps brown the surface of the liver and onions.

The step that matters

Drying the liver before cooking. Surface moisture steams the slices instead of letting them brown, so patting them thoroughly dry helps them sear well.

Swap the onion

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

  1. Capsicumfits better
  2. Carrotfits better
  3. Mustardfits about as well
  4. Onionthe original

Fit is the average pairing score against liver, pepper. 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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