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Fried Potatoes and Onions

A simple pan‑fried dish of sliced onions and potato slices seasoned with butter, oil, parsley, salt, pepper, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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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 ↓

Fried Potatoes and Onions

Ingredients

Directions

  1. In a frying pan, heat the butter and oil over medium heat.

  2. Add the sliced onions and fry until softened.

  3. Add the cold potato slices and toss occasionally until they turn golden brown.

  4. Stir in the chopped parsley, salt, pepper, and lemon juice.

  5. Shake the pan to mix everything well 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. Parsley + lemontop 1% of all pairs
    Smell alikestrong
    Cooked together14,037 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  2. Parsley + peppertop 2% of all pairs
    Smell alikestrong
    Cooked together34,122 recipes

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

  3. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

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

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

  5. 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 to a golden, crisp surface in the hot fat.
Onions
Soften and turn sweet as they fry, adding flavour to the potatoes.
Butter
Adds richness and flavour, and helps the potatoes and onions brown.
Lemon juice
Adds acidity that brightens the flavour of the fried potatoes and onions.

The step that matters

Browning the potatoes. Cold potato slices need enough hot fat and room in the pan to brown rather than steam. Crowding the pan or tossing too little lowers the surface temperature, so the potatoes turn soft and pale instead of golden.

Swap the onion

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

  1. Carrotfits better
  2. Chivefits better
  3. Shallotfits better
  4. Onionthe original

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

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