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Lyonnaise Potatoes

A side dish of diced boiled potatoes sautéed with onion, butter, salt, pepper, and optional parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Pepper and parsley match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓

Lyonnaise Potatoes

Ingredients

Directions

Prepare and cook

  1. Cut the cold boiled potatoes into dice and season with salt and pepper.

  2. Fry the minced onion in butter until light brown.

  3. Add the potatoes and stir gently with a fork until the butter is absorbed.

Finish and serve

  1. Add chopped parsley if desired 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 + parsleytop 2% of all pairs
    Smell alikestrong
    Cooked together34,122 recipes

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

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

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

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

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

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

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

  5. Potato + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together8,305 recipes

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

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

What each ingredient does

Cold boiled potatoes
Provide the main body of the dish; cold, firm potatoes hold their shape when diced and fried.
Butter
Adds fat for frying and richness, and carries the flavour of the onion through the potatoes.
Minced onion
Adds savoury, aromatic flavour, and browning in butter gives it a sweeter taste.

The step that matters

Stirring the potatoes gently with the onion and butter. Cold potatoes are firm and fragile when diced; vigorous stirring breaks them into mush. Gentle folding keeps the pieces whole and lets them take up the butter evenly.

Swap the parsley

The recipe marks parsley as optional. How well each one fits the dish's main ingredients (potato, onion, butter, pepper):

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

Fit is the average pairing score against potato, onion, butter, 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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