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Lyonnaise Potatoes

Sautéed potatoes with onions and parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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. Cut cold potatoes into dice.

  2. Heat fat in a saucepan over medium heat.

Cook

  1. Add the finely shredded onion and cook until browned.

  2. Add the diced potatoes and cook until well done.

  3. Just before serving, stir in the chopped parsley.

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. Butter + oniontop 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

Cold potatoes
Form the main body of the dish, holding their shape as diced pieces that crisp at the surface.
Fat (butter or oil)
Conducts heat to the potatoes and promotes browning on their cut surfaces.
Onion
Adds savoury sweetness and aroma as it browns in the fat.
Parsley
Adds fresh aroma and colour at the end of cooking.

The step that matters

Add the diced potatoes and cook until well done. Cold potatoes have firmer starch that holds its shape when diced, but the pieces must cook through in the fat. Stirring too often prevents browning, while too little heat leaves them soft and pale rather than crisp at the edges.

Swap the parsley

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

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

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