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Lyonnaise Potatoes

A sautéed potato dish with onions, butter, salt, and parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Lyonnaise Potatoes

Ingredients

Directions

Prepare

  1. Boil, peel, and slice the potatoes.

Cook

  1. Heat the butter in a frying pan and add the sliced onion.

  2. Cook the onion until it is slightly brown.

  3. Add the potatoes to the pan and season with salt.

  4. Cook until the potatoes are golden brown.

  5. Sprinkle the chopped parsley over the potatoes before serving.

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. Potato + oniontop 3% of all pairs
    Smell alikemoderate
    Cooked together9,023 recipes

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

  2. Potato + parsleytop 5% of all pairs
    Smell alikemoderate
    Cooked together2,855 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  3. Onion + parsleytop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  4. Potato + buttertop 13% of all pairs
    Smell alikemoderate
    Cooked together6,456 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

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

Potatoes
Form the bulk of the dish, becoming golden and crisp on the outside while staying tender inside.
Onion
Softens and browns in the butter, adding sweetness and savory depth to the potatoes.
Butter
Conducts heat for even frying and adds richness and flavor to the potatoes and onion.

The step that matters

Cook the potatoes until golden brown. Potatoes need enough time in a hot, lightly fatty pan for their surfaces to brown. Crowding or stirring too often prevents browning and leaves them soft and pale.

Swap the parsley

How well each one fits the dish's main ingredients (potato, onion, butter):

  1. Garlicfits better
  2. Thymefits about as well
  3. Parsleythe original
  4. Capersfits less well

Fit is the average pairing score against potato, onion, 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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