Name: Lyonnaise Potatoes
Ingredients: 6 boiled potatoes; ⅛ teaspoon pepper; 2 tablespoons butter; 1 teaspoon minced parsley; 1 chopped onion; ¼ teaspoon lemon juice; 1 teaspoon salt

Why it works: Parsley and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 14,037 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

Lyonnaise Potatoes

Ingredients

Directions

In an omelet pan, melt the butter and sauté the chopped onion until soft.
Add the boiled potatoes, pepper, and salt; mix well and sauté until golden brown.
Just before serving, stir in the minced parsley and lemon juice.

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.

Parsley + lemontop 1% of all pairs

Smell alikestrong

Cooked together14,037 recipes

Shared aroma: beta-phellandrene (minty, terpene).
Pepper + parsleytop 2% of all pairs

Smell alikestrong

Cooked together34,122 recipes

Shared aroma: 4'-methylacetophenone (bitter almond).
Pepper + lemontop 3% of all pairs

Smell alikestrong

Cooked together27,047 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Potato + oniontop 3% of all pairs

Smell alikemoderate

Cooked together9,023 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Potato + parsleytop 5% of all pairs

Smell alikemoderate

Cooked together2,855 recipes

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

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 and brown on the outside while staying tender inside.
Butter: Carries the heat and adds richness, helping the potatoes and onion brown in the pan.
Onion: Softens and sweetens as it cooks, adding savory flavor to the potatoes.

The step that matters

Sautéing the potatoes until golden brown. Browning depends on the potatoes being dry on the surface and left undisturbed long enough in hot fat for the Maillard reaction to develop. Stirring constantly or crowding the pan causes steaming, which leaves them pale and soft instead of crisp and golden.

Swap the onion

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

Carrotfits better
Chivefits better
Shallotfits better
Onionthe original

Fit is the average pairing score against potato, pepper, butter, parsley, lemon. 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.