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Lyonnaise Potatoes

A baked potato dish with onions, butter, flour, milk, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Onion and potato 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

Oven, in the book's wordsA moderate oven

Ingredients

Directions

The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.

Assemble

  1. Layer the sliced onions and potatoes in a baking dish.

Make the sauce

  1. Cream the butter with the flour, then add the salt and boiling milk.

  2. Cook the mixture until thick, then pour it over the layered potatoes and onions.

Bake

  1. Dust with pepper and bake uncovered for 30 minutes at 350°F (175°C), or cover and cook on the stove.

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. Onion + potatotop 3% of all pairs
    Smell alikemoderate
    Cooked together9,023 recipes

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

  2. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

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

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

  4. Potato + milktop 9% of all pairs
    Smell alikemoderate
    Cooked together3,611 recipes

    Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

  5. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 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

Potatoes
Form the bulk of the dish, staying tender and soaking up the creamy sauce.
Onions
Add sweetness and savory depth as they soften under the sauce.
Butter
Adds richness and fat that carries flavor and helps the sauce feel smooth.
Flour
Thickens the milk into a smooth, cohesive sauce when cooked.
Milk
Forms the creamy base of the sauce that coats the potatoes and onions.

The step that matters

Cook the sauce until thick. Flour must be cooked long enough in the hot liquid to thicken fully and lose its raw taste. Pouring the sauce too early leaves it thin and floury.

Swap the onion

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

  1. Chivefits better
  2. Capsicumfits better
  3. Asparagusfits better
  4. Onionthe original

Fit is the average pairing score against potato, butter, flour, milk, 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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